Compound and organic light-emitting device including the same

ABSTRACT

Provided is a compound represented by Formula 1 and an organic light-emitting device including the same. The organic light-emitting device includes: a first electrode; a second electrode facing the first electrode; and an organic layer between the first electrode and the second electrode, the organic layer including an emission layer and the compound represented by Formula 1.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority to and the benefit of Korean PatentApplication No. 10-2019-0023293, filed on Feb. 27, 2019, in the KoreanIntellectual Property Office, the entire content of which isincorporated herein by reference.

BACKGROUND 1. Field

One or more embodiments relate to a compound and an organiclight-emitting device including the same.

2. Description of the Related Art

Organic light-emitting devices are self-emission devices that have wideviewing angles, high contrast ratios, short response times, andexcellent characteristics in terms of brightness, driving voltage, andresponse speed, as compared to other devices in the art.

An example of such organic light-emitting devices may include a firstelectrode on a substrate, and a hole transport region, an emissionlayer, an electron transport region, and a second electrode, which aresequentially on the first electrode.

Holes provided from the first electrode may move toward the emissionlayer through the hole transport region, and electrons provided from thesecond electrode may move toward the emission layer through the electrontransport region. Carriers, such as holes and electrons, recombine inthe emission layer to produce excitons. The excitons transit (e.g.,transition or relax) from an excited state to a ground state, therebygenerating light.

SUMMARY

Aspects of embodiments of the present disclosure provide an emissionlayer compound having high luminescence efficiency, as compared with therelated art, and a device including the same.

Additional aspects of embodiments will be set forth in part in thedescription which follows and, in part, will be apparent from thedescription, or may be learned by practice of the presented embodiments.

An aspect of an embodiment of the present disclosure provides a compoundrepresented by Formula 1:

In Formula 1,

-   -   X₁ and X₂ may each independently be selected from a single bond,        O, S, NR₁₁R₁₂, CR₁₃R₁₄, and SiR₁₅R₁₆,    -   R₁ to R₉ and R₁₁ to R₁₆ may each independently be selected from        hydrogen, deuterium, a substituted or unsubstituted C₁-C₆₀ alkyl        group, a substituted or unsubstituted C₂-C₆₀ alkenyl group, a        substituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted        or unsubstituted C₁-C₆₀ alkoxy group, a substituted or        unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted or        unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted or        unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted        C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀        arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroaryl        group, a substituted or unsubstituted monovalent non-aromatic        condensed polycyclic group, a substituted or unsubstituted        monovalent non-aromatic condensed heteropolycyclic group,        —Si(Q₁)(Q₂)(Q₃), —N(Q₁)(Q₂), —B(Q₁)(Q₂), —P(Q₁)(Q₂), —C(═O)(Q₁),        —S(═O)₂(Q₁), and —P(═O)(Q₁)(Q₂),    -   L₁ to L₄ may each independently be selected from a single bond,        a substituted or unsubstituted C₄-C₆₀ carbocyclic group, and a        substituted or unsubstituted C₁-C₆₀ heterocyclic group, wherein        a case where L₂ to L₄ are each a single bond at the same time is        excluded,    -   n may be 0 or 1,    -   a1 and a2 may each independently be 0 or 1,    -   when a2 is 0, n may be 0,    -   b3, b4, and b6 to b9 may each independently be an integer from 1        to 4,    -   b5 may be an integer from 1 to 5,    -   when b3 to b9 are each independently two or more, two or more        adjacent substituents selected from R₃, R₄, R₅, R₆, R₇, R₈, and        R₉ may be coupled to form a ring,    -   at least one substituent of the substituted C₁-C₆₀ alkyl group,        the substituted C₂-C₆₀ alkenyl group, the substituted C₂-C₆₀        alkynyl group, the substituted C₁-C₆₀ alkoxy group, the        substituted C₃-C₁₀ cycloalkyl group, the substituted C₁-C₁₀        heterocycloalkyl group, the substituted C₃-C₁₀ cycloalkenyl        group, the substituted C₁-C₁₀ heterocycloalkenyl group, the        substituted C₆-C₆₀ aryl group, the substituted C₆-C₆₀ arylene        group, the substituted C₆-C₆₀ aryloxy group, the substituted        C₆-C₆₀ arylthio group, the substituted C₁-C₆₀ heteroaryl group,        the substituted C₁-C₆₀ heteroarylene group, the substituted        monovalent non-aromatic condensed polycyclic group, the        substituted monovalent non-aromatic condensed heteropolycyclic        group, the substituted C₄-C₆₀ carbocyclic group, and the        substituted C₁-C₆₀ heterocyclic group may be selected from:    -   deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀        alkynyl group, and a C₁-C₆₀ alkoxy group;    -   a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl        group, and a C₁-C₆₀ alkoxy group, each substituted with at least        one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amidino group, a hydrazino        group, a hydrazono group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀        heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀        heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy        group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a        monovalent non-aromatic condensed polycyclic group, a monovalent        non-aromatic condensed heteropolycyclic group,        —Si(Q₁₁)(Q₁₂)(Q₁₃), —N(Q₁₁)(Q₁₂), —B(Q₁₁)(Q₁₂), —C(═O)(Q₁₁),        —S(═O)₂(Q₁₁), and —P(═O)(Q₁₁)(Q₁₂);    -   a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic        condensed polycyclic group, and a monovalent non-aromatic        condensed heteropolycyclic group;    -   a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic        condensed polycyclic group, and a monovalent non-aromatic        condensed heteropolycyclic group, each substituted with at least        one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amidino group, a hydrazino        group, a hydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl        group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀        cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀        cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀        aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a        C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed        polycyclic group, a monovalent non-aromatic condensed        heteropolycyclic group, —Si(Q₂₁)(Q₂₂)(Q₂₃), —N(Q₂₁)(Q₂₂),        —B(Q₂₁)(Q₂₂), —C(═O)(Q₂₁), —S(═O)₂(Q₂₁), and —P(═O)(Q₂₁)(Q₂₂);        and    -   —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁),        —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂), and    -   Q₁ to Q₃, Q₁₁ to Q₁₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ are each        independently selected from hydrogen, deuterium, —F, —Cl, —Br,        —I, a hydroxyl group, a cyano group, a nitro group, an amidino        group, a hydrazino group, a hydrazono group, a C₁-C₆₀ alkyl        group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀        alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀        heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀        heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀        heteroaryl group, a monovalent non-aromatic condensed polycyclic        group, a monovalent non-aromatic condensed heteropolycyclic        group, a biphenyl group, and a terphenyl group.

Another aspect of an embodiment of the present disclosure provides anorganic light-emitting device including:

-   -   a first electrode;    -   a second electrode facing the first electrode; and    -   an organic layer between the first electrode and the second        electrode and including an emission layer,    -   wherein the organic layer includes a compound represented by        Formula 1.

Another aspect of an embodiment of the present disclosure provides anelectronic apparatus including a thin-film transistor and an organiclight-emitting device, wherein the thin-film transistor includes asource electrode, a drain electrode, an activation layer (e.g., anactive layer), and a gate electrode, and the first electrode of theorganic light-emitting device is electrically coupled to one of thesource electrode and the drain electrode of the thin-film transistor.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects of embodiments will become apparent and morereadily appreciated from the following description of the embodiments,taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic view of a structure of an organic light-emittingdevice according to an embodiment;

FIG. 2 is a schematic view of a structure of an organic light-emittingdevice according to another embodiment;

FIG. 3 is a schematic view of a structure of an organic light-emittingdevice according to another embodiment; and

FIG. 4 is a schematic view of a structure of an organic light-emittingdevice according to another embodiment.

DETAILED DESCRIPTION

Reference will now be made in more detail to embodiments, examples ofwhich are illustrated in the accompanying drawings, wherein likereference numerals refer to like elements throughout. In this regard,the present embodiments may have different forms and should not beconstrued as being limited to the descriptions set forth herein.Accordingly, the embodiments are merely described herein below, byreferring to the figures, to explain aspects of embodiments of thepresent description. As used herein, the term “and/or” includes any andall combinations of one or more of the associated listed items.Expressions such as “at least one of,” when preceding a list ofelements, modify the entire list of elements and do not modify theindividual elements of the list.

An aspect of an embodiment of the present disclosure provides a compoundrepresented by Formula 1:

In Formula 1,

-   -   X₁ and X₂ may each independently be selected from a single bond,        O, S, NR₁₁R₁₂, CR₁₃R₁₄, and SiR₁₅R₁₆,    -   R₁ to R₉ and R₁₁ to R₁₆ may each independently be selected from        hydrogen, deuterium, a substituted or unsubstituted C₁-C₆₀ alkyl        group, a substituted or unsubstituted C₂-C₆₀ alkenyl group, a        substituted or unsubstituted C₂-C₆₀ alkynyl group, a substituted        or unsubstituted C₁-C₆₀ alkoxy group, a substituted or        unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted or        unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted or        unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted        C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀        arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroaryl        group, a substituted or unsubstituted monovalent non-aromatic        condensed polycyclic group, a substituted or unsubstituted        monovalent non-aromatic condensed heteropolycyclic group,        —Si(Q₁)(Q₂)(Q₃), —N(Q₁)(Q₂), —B(Q₁)(Q₂), —P(Q₁)(Q₂), —C(═O)(Q₁),        —S(═O)₂(Q₁), and —P(═O)(Q₁)(Q₂),    -   L₁ to L₄ may each independently be selected from a single bond,        a substituted or unsubstituted C₄-C₆₀ carbocyclic group, and a        substituted or unsubstituted C₁-C₆₀ heterocyclic group, wherein        a case where L₂ to L₄ are each a single bond at the same time is        excluded,    -   n may be 0 or 1,    -   a1 and a2 may each independently be 0 or 1,    -   when a2 is 0, n may be 0,    -   b3, b4, and b6 to b9 may each independently be an integer from 1        to 4,    -   b5 may be an integer from 1 to 5,    -   when b3 to b9 are each independently two or more, two or more        adjacent substituents selected from R₃, R₄, R₅, R₆, R₇, R₈, and        R₉ may be coupled to form a ring,    -   at least one substituent of the substituted C₁-C₆₀ alkyl group,        the substituted C₂-C₆₀ alkenyl group, the substituted C₂-C₆₀        alkynyl group, the substituted C₁-C₆₀ alkoxy group, the        substituted C₃-C₁₀ cycloalkyl group, the substituted C₁-C₆₀        heterocycloalkyl group, the substituted C₃-C₁₀ cycloalkenyl        group, the substituted C₁-C₁₀ heterocycloalkenyl group, the        substituted C₆-C₆₀ aryl group, the substituted C₆-C₆₀ arylene        group, the substituted C₆-C₆₀ aryloxy group, the substituted        C₆-C₆₀ arylthio group, the substituted C₁-C₆₀ heteroaryl group,        the substituted C₁-C₆₀ heteroarylene group, the substituted        monovalent non-aromatic condensed polycyclic group, the        substituted monovalent non-aromatic condensed heteropolycyclic        group, the substituted C₄-C₆₀ carbocyclic group, and the        substituted C₁-C₆₀ heterocyclic group may be selected from:    -   deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀        alkynyl group, and a C₁-C₆₀ alkoxy group;    -   a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl        group, and a C₁-C₆₀ alkoxy group, each substituted with at least        one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amidino group, a hydrazino        group, a hydrazono group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀        heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀        heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy        group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a        monovalent non-aromatic condensed polycyclic group, a monovalent        non-aromatic condensed heteropolycyclic group,        —Si(Q₁₁)(Q₁₂)(Q₁₃), —N(Q₁₁)(Q₁₂), —B(Q₁₁)(Q₁₂), —C(═O)(Q₁₁),        —S(═O)₂(Q₁₁), and —P(═O)(Q₁₁)(Q₁₂);    -   a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic        condensed polycyclic group, and a monovalent non-aromatic        condensed heteropolycyclic group;    -   a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic        condensed polycyclic group, and a monovalent non-aromatic        condensed heteropolycyclic group, each substituted with at least        one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amidino group, a hydrazino        group, a hydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl        group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀        cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀        cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀        aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a        C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed        polycyclic group, a monovalent non-aromatic condensed        heteropolycyclic group, —Si(Q₂₁)(Q₂₂)(Q₂₃), —N(Q₂₁)(Q₂₂),        —B(Q₂₁)(Q₂₂), —C(═O)(Q₂₁), —S(═O)₂(Q₂₁), and —P(═O)(Q₂₁)(Q₂₂);        and    -   —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁),        —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂), and    -   Q₁ to Q₃, Q₁₁ to Q₁₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ may each        independently be selected from hydrogen, deuterium, —F, —Cl,        —Br, —I, a hydroxyl group, a cyano group, a nitro group, an        amidino group, a hydrazino group, a hydrazono group, a C₁-C₆₀        alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a        C₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀        heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀        heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀        heteroaryl group, a monovalent non-aromatic condensed polycyclic        group, a monovalent non-aromatic condensed heteropolycyclic        group, a biphenyl group, and a terphenyl group.

The compound according to embodiments of the present disclosure differsfrom existing Si compounds, in which a compound includes one or morecarbazole groups linked to Si, or in which a compound includes afluorene group and a carbazole group substituted on one side of Si.

For example, the compound represented by Formula 1, according to one ormore embodiments, is not a compound in which both the heterocycliccompound and the fluorene group exist on one side of Si. Instead thecompound represented by Formula 1 is one in which the heterocycliccompound and the fluorene group are each linked to Si. In other words,in the compound represented by Formula 1, according to one or moreembodiments, the central Si atom has four substituents, two of which aregeneral substituents. For example, one substituent is a substituent inwhich the heterocyclic compound is directly or indirectly linked to Si,and the other substituent is a substituent in which the fluorene groupis directly or indirectly linked to Si. The term “indirectly linked,” asused herein, means “being linked via a linker.” For example, the linkerin the compound represented by Formula 1, according to one or moreembodiments, refers to L₁ to L₄.

Since the compound represented by Formula 1, according to one or moreembodiments, has a structure that includes the fluorene group, a glasstransition temperature and thermal stability of the compound are high,and energy levels of the compound and steric hindrance effect may besuitably or appropriately adjusted by introducing various suitablesubstituents.

In addition, due to the silicon atom that acts as a bridge in thecompound represented by Formula 1, an intramolecular steric effectincreases, a dihedral angle between atoms increases, and anintermolecular interaction decreases. Therefore, the compoundrepresented by Formula 1 may have relatively high triplet energy.

Because Si in the compound represented by Formula 1 has foursubstituents, a case where L₂ to L₄ in Formula 1 are each a single bondat the same time is excluded. Further, because Si in the compoundrepresented by Formula 1 has four substituents, n is 0 when a2 is 0, andn is 0 when L₂ is a single bond.

In Formula 1, when b3 to b9 are each independently two or more, two ormore adjacent substituents selected from R₃, R₄, R₅, R₆, R₇, R₈, and R₉may be coupled to form a ring. For example, when b5 is 2, one R₅ is aphenyl group, and another R₅ is a phenyl amine group, the phenyl groupand the phenyl amine group neighboring to each other may be combined toform a ring. For example, Compound 10, which is shown herein below,corresponds to such a case.

In one embodiment, X₁ and X₂ may each independently be selected from asingle bond, O, S, CR₁₃R₁₄, and SiR₁₅R₁₆. For example, X₁ and X₂ mayeach independently be selected from a single bond, O, S, C(CH₃)₂, andSi(CH₃)₂.

In one embodiment, L₁ to L₄ may each independently be selected from asingle bond, a phenylene group, a naphthylene group, a phenanthrenylenegroup, an anthracenylene group, a pyrenylene group, a chrysenylenegroup, a pyridinylene group, a pyrazinylene group, a pyrimidinylenegroup, a pyridazinylene group, a quinolinylene group, anisoquinolinylene group, a quinoxalinylene group, a quinazolinylenegroup, a carbazolylene group, and a triazinylene group. For example, L₁to L₄ may each independently be selected from a single bond and aphenylene group.

In one embodiment, L₁ and L₂ may each independently be a phenylene groupat the same time, and L₃ and L₄ may each independently be a single bondor a phenylene group.

For example, Formula 1 may be represented by Formula 2:

Definitions of substituents in Formula 2 are the same as those ofsubstituents in Formula 1.

In one embodiment, R₁ and R₂ may each independently be selected from aphenyl group, a biphenyl group, a terphenyl group, a naphthyl group, aphenanthrenyl group, an anthracenyl group, a pyrenyl group, a chrysenylgroup, a pyridinyl group, a pyrazinyl group, a pyrimidinyl group, apyridazinyl group, a quinolinyl group, an isoquinolinyl group, aquinoxalinyl group, a quinazolinyl group, a carbazolyl group, adibenzofuranyl group, a dibenzothiophenyl group, a triazinyl group, abenzimidazolyl group, and a phenanthrolinyl group. For example, R₁ andR₂ may each independently be a phenyl group.

In one embodiment, R₁ and R₂ may each independently be represented byFormula 2a:

In Formula 2a,

-   -   R₂₁ may be selected from hydrogen, deuterium, —F, —Cl, —Br, —I,        a hydroxyl group, a cyano group, a nitro group, an amino group,        an amidino group, a hydrazine group, a hydrazone group, a        carboxylic acid group or a salt thereof, a sulfonic acid group        or a salt thereof, a phosphoric acid group or a salt thereof, a        C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a        biphenyl group, a terphenyl group, a naphthyl group, a        phenanthrenyl group, an anthracenyl group, a pyrenyl group, a        chrysenyl group, a pyridinyl group, a pyrazinyl group, a        pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an        isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group,        a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl        group, a triazinyl group, a benzimidazolyl group, and a        phenanthrolinyl group,    -   a21 may be an integer from 0 to 4, and    -   indicates a binding site to a neighboring atom.

In one embodiment, R₁₁ to R₁₆ may each independently be selected from amethyl group, an ethyl group, an n-propyl group, an isopropyl group, ann-butyl group, an isobutyl group, a sec-butyl group, and a tert-butylgroup. For example, R₁₁ to R₁₆ may each independently be a methyl group.

In one embodiment, R₃, R₄, and R₅ may each independently be representedby hydrogen, deuterium, —N(Q₁)(Q₂), and Formula 3a:

In Formula 3a,

-   -   R₃₁ may be selected from hydrogen, deuterium, —F, —Cl, —Br, —I,        a hydroxyl group, a cyano group, a nitro group, an amino group,        an amidino group, a hydrazine group, a hydrazone group, a        carboxylic acid group or a salt thereof, a sulfonic acid group        or a salt thereof, a phosphoric acid group or a salt thereof, a        C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl group, a        biphenyl group, a terphenyl group, a naphthyl group, a        phenanthrenyl group, an anthracenyl group, a pyrenyl group, a        chrysenyl group, a pyridinyl group, a pyrazinyl group, a        pyrimidinyl group, a pyridazinyl group, a quinolinyl group, an        isoquinolinyl group, a quinoxalinyl group, a quinazolinyl group,        a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenyl        group, a triazinyl group, a benzimidazolyl group, and a        phenanthrolinyl group,    -   a31 may be an integer from 0 to 4, and    -   indicate a binding site to a neighboring atom.

In one embodiment, R₆ to R₉ may each independently be selected fromhydrogen, deuterium, —Si(Q₁)(Q₂)(Q₃), a methyl group, an ethyl group, ann-propyl group, an isopropyl group, an n-butyl group, an isobutyl group,a sec-butyl group, and a tert-butyl group. For example, R₆ to R₉ mayeach independently be selected from hydrogen, deuterium, —Si(Ph)₃, and atert-butyl group.

In one embodiment, the compound represented by Formula 1 may be selectedfrom Compounds 1 to 33:

The expression “(an organic layer) includes at least one of compounds,”as used herein, may include a case in which “(an organic layer) includesidentical compounds represented by Formula 1” and a case in which “(anorganic layer) includes two or more different compounds represented byFormula 1.”

For example, the organic layer may include, as the compound representedby Formula 1, only Compound 1. In this regard, Compound 1 may exist onlyin an emission layer of the organic light-emitting device. In one ormore embodiments, the organic layer may include, as the compoundrepresented by Formula 1, Compound 1 and Compound 2. In this case,Compound 1 and Compound 2 may be present in an identical layer (forexample, Compound 1 and Compound 2 may all be present in an emissionlayer), or different layers (for example, Compound 1 may be present inan emission layer and Compound 2 may be present in an electron transportregion).

Another aspect of an embodiment of the present disclosure provides anorganic light-emitting device including:

-   -   a first electrode;    -   a second electrode facing the first electrode; and    -   an organic layer between the first electrode and the second        electrode, the organic layer including an emission layer and the        compound represented by Formula 1.

In one embodiment,

-   -   the first electrode of the organic light-emitting device may be        an anode,    -   the second electrode of the organic light-emitting device may be        a cathode,    -   the organic layer may further include a hole transport region        between the first electrode and the emission layer and an        electron transport region between the emission layer and the        second electrode,    -   the hole transport region may include a hole injection layer, a        hole transport layer, a buffer layer, an electron blocking        layer, or any combination thereof, and    -   the electron transport region may include a hole blocking layer,        an electron transport layer, an electron injection layer, or any        combination thereof.

In one embodiment, the emission layer may be a phosphorescence emissionlayer, and may include the compound of Formula 1 as a host.

In one or more embodiments, the emission layer may be a phosphorescenceemission layer, and may include the compound of Formula 1 as a dopant ora host.

In one embodiment, the compound of Formula 1 may be a thermallyactivated delayed fluorescence material. For example, the compound ofFormula 1 may be a compound configured to emit light by way of thermallyactivated delayed fluorescence.

Another aspect of an embodiment of the present disclosure provides anelectronic apparatus including: a thin-film transistor and the organiclight-emitting device, wherein the thin-film transistor includes asource electrode, a drain electrode, an activation layer (e.g., anactive layer), and a gate electrode, and the first electrode of theorganic light emitting device may be electrically coupled to one of thesource electrode and the drain electrode of the thin-film transistor.

The term “an organic layer,” as used herein, refers to a single layerand/or a plurality of layers between the first electrode and the secondelectrode of the organic light-emitting device. A material included inthe “organic layer” is not limited to an organic material. For example,the organic layer may include an inorganic material.

Description of FIG. 1

FIG. 1 is a schematic cross-sectional view of an organic light-emittingdevice 10 according to an embodiment. The organic light-emitting device10 includes a first electrode 110, an organic layer 150, and a secondelectrode 190.

Hereinafter, the structure of the organic light-emitting device 10according to an embodiment and a method of manufacturing the organiclight-emitting device 10 according to an embodiment will be described inconnection with FIG. 1.

First Electrode 110

In FIG. 1, a substrate may be additionally under the first electrode 110or above the second electrode 190. For use as the substrate, thesubstrate may be a glass substrate or a plastic substrate, each havingexcellent mechanical strength, thermal stability, transparency, surfacesmoothness, ease of handling, and water resistance.

The first electrode 110 may be formed by depositing or sputtering amaterial for forming the first electrode 110 on the substrate. When thefirst electrode 110 is an anode, the material for forming the firstelectrode 110 may be selected from materials with a high work functionto facilitate hole injection.

The first electrode 110 may be a reflective electrode, a semi-reflectiveelectrode, or a transmissive electrode. When the first electrode 110 isa transmissive electrode, a material for forming a first electrode maybe selected from indium tin oxide (ITO), indium zinc oxide (IZO), tinoxide (SnO₂), zinc oxide (ZnO), and any combinations thereof, butembodiments of the present disclosure are not limited thereto. In one ormore embodiments, when the first electrode 110 is a semi-transmissiveelectrode or a reflectable electrode, a material for forming a firstelectrode may be selected from magnesium (Mg), silver (Ag), aluminum(Al), aluminum-lithium (Al—Li), calcium (Ca), magnesium-indium (Mg—In),magnesium-silver (Mg—Ag), and any combinations thereof, but embodimentsof the present disclosure are not limited thereto.

The first electrode 110 may have a single-layered structure, or amulti-layered structure including two or more layers. For example, thefirst electrode 110 may have a three-layered structure of ITO/Ag/ITO,but the structure of the first electrode 110 is not limited thereto.

Organic Layer 150

The organic layer 150 is on the first electrode 110. The organic layer150 may include an emission layer.

The organic layer 150 may further include a hole transport regionbetween the first electrode 110 and the emission layer and an electrontransport region between the emission layer and the second electrode190.

Hole Transport Region in Organic Layer 150

The hole transport region may have i) a single-layered structureincluding a single layer including a single material, ii) asingle-layered structure including a single layer including a pluralityof different materials, or iii) a multi-layered structure having aplurality of layers including a plurality of different materials.

The hole transport region may include at least one layer selected from ahole injection layer, a hole transport layer, an emission auxiliarylayer, and an electron blocking layer.

For example, the hole transport region may have a single-layeredstructure including a single layer including a plurality of differentmaterials, or a multi-layered structure having a hole injectionlayer/hole transport layer structure, a hole injection layer/holetransport layer/emission auxiliary layer structure, a hole injectionlayer/emission auxiliary layer structure, a hole transportlayer/emission auxiliary layer structure, or a hole injection layer/holetransport layer/electron blocking layer structure, wherein for eachstructure, constituting layers are sequentially stacked from the firstelectrode 110 in this stated order, but the structure of the holetransport region is not limited thereto.

The hole transport region may include at least one selected fromm-MTDATA, TDATA, 2-TNATA, NPB (NPD), β-NPB, TPD, spiro-TPD, spiro-NPB,methylated-NPB, TAPC, HMTPD, 4,4′,4″-tris(N-carbazolyl)triphenylamine(TCTA), polyaniline/dodecylbenzenesulfonic acid (PANI/DBSA),poly(3,4-ethylenedioxythiophene)/poly(4-styrenesulfonate) (PEDOT/PSS),polyaniline/camphor sulfonic acid (PANI/CSA),polyaniline/poly(4-styrenesulfonate) (PANI/PSS), a compound representedby Formula 201, and a compound represented by Formula 202:

In Formulae 201 and 202,

-   -   L₂₀₁ to L₂₀₄ may each independently be selected from a        substituted or unsubstituted C₃-C₁₀ cycloalkylene group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkylene group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenylene group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenylene group,        a substituted or unsubstituted C₆-C₆₀ arylene group, a        substituted or unsubstituted C₁-C₆₀ heteroarylene group, a        substituted or unsubstituted divalent non-aromatic condensed        polycyclic group, and a substituted or unsubstituted divalent        non-aromatic condensed heteropolycyclic group,    -   L₂₀₅ may be selected from *—O—*′, *—S—*′, *—N(Q₂₀₁)—*′, a        substituted or unsubstituted C₁-C₂₀ alkylene group, a        substituted or unsubstituted C₂-C₂₀ alkenylene group, a        substituted or unsubstituted C₃-C₁₀ cycloalkylene group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkylene group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenylene group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenylene group,        a substituted or unsubstituted C₆-C₆₀ arylene group, a        substituted or unsubstituted C₁-C₆₀ heteroarylene group, a        substituted or unsubstituted divalent non-aromatic condensed        polycyclic group, and a substituted or unsubstituted divalent        non-aromatic condensed heteropolycyclic group,    -   xa1 to xa4 may each independently be an integer from 0 to 3,    -   xa5 may be an integer from 1 to 10,    -   R₂₀₁ to R₂₀₄ and Q₂₀₁ may each independently be selected from a        substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, a        substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or        unsubstituted C₆-C₆₀ aryloxy group, a substituted or        unsubstituted C₆-C₆₀ arylthio group, a substituted or        unsubstituted C₁-C₆₀ heteroaryl group, a substituted or        unsubstituted monovalent non-aromatic condensed polycyclic        group, and a substituted or unsubstituted monovalent        non-aromatic condensed heteropolycyclic group.

For example, in Formula 202, R₂₀₁ and R₂₀₂ may optionally be linked viaa single bond, a dimethyl-methylene group, or a diphenyl-methylenegroup, and R₂₀₃ and R₂₀₄ may optionally be Inked via a single bond, adimethyl-methylene group, or a diphenyl-methylene group.

In one embodiment, in Formulae 201 and 202,

-   -   L₂₀₁ to L₂₀₅ may each independently be selected from:    -   a phenylene group, a pentalenylene group, an indenylene group, a        naphthylene group, an azulenylene group, a heptalenylene group,        an indacenylene group, an acenaphthylene group, a fluorenylene        group, a spiro-bifluorenylene group, a benzofluorenylene group,        a dibenzofluorenylene group, a phenalenylene group, a        phenanthrenylene group, an anthracenylene group, a        fluoranthenylene group, a triphenylenylene group, a pyrenylene        group, a chrysenylene group, a naphthacenylene group, a        picenylene group, a perylenylene group, a pentaphenylene group,        a hexacenylene group, a pentacenylene group, a rubicenylene        group, a coronenylene group, an ovalenylene group, a        thiophenylene group, a furanylene group, a carbazolylene group,        an indolylene group, an isoindolylene group, a benzofuranylene        group, a benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, and a        pyridinylene group; and    -   a phenylene group, a pentalenylene group, an indenylene group, a        naphthylene group, an azulenylene group, a heptalenylene group,        an indacenylene group, an acenaphthylene group, a fluorenylene        group, a spiro-bifluorenylene group, a benzofluorenylene group,        a dibenzofluorenylene group, a phenalenylene group, a        phenanthrenylene group, an anthracenylene group, a        fluoranthenylene group, a triphenylenylene group, a pyrenylene        group, a chrysenylene group, a naphthacenylene group, a        picenylene group, a perylenylene group, a pentaphenylene group,        a hexacenylene group, a pentacenylene group, a rubicenylene        group, a coronenylene group, an ovalenylene group, a        thiophenylene group, a furanylene group, a carbazolylene group,        an indolylene group, an isoindolylene group, a benzofuranylene        group, a benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, and a        pyridinylene group, each substituted with at least one selected        from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano        group, a nitro group, an amidino group, a hydrazino group, a        hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a        cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a        cyclopentenyl group, a cyclohexenyl group, a phenyl group, a        biphenyl group, a terphenyl group, a phenyl group substituted        with a C₁-C₁₀ alkyl group, a phenyl group substituted with —F, a        pentalenyl group, an indenyl group, a naphthyl group, an        azulenyl group, a heptalenyl group, an indacenyl group, an        acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group,        a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl        group, a phenanthrenyl group, an anthracenyl group, a        fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a        chrysenyl group, a naphthacenyl group, a picenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a rubicenyl group, a coronenyl group, an        ovalenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, —Si(Q₃₁)(Q₃₂)(Q₃₃), and —N(Q₃₁)(Q₃₂), and    -   Q₃₁ to Q₃₃ may each independently be selected from a C₁-C₁₀        alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl        group, a terphenyl group, and a naphthyl group.

In one or more embodiments, xa1 to xa4 may each independently be 0, 1,or 2.

In one or more embodiments, xa5 may be 1, 2, 3, or 4.

In one or more embodiments, R₂₀₁ to R₂₀₄ and Q₂₀₁ may each independentlybe selected from:

-   -   a phenyl group, a biphenyl group, a terphenyl group, a        pentalenyl group, an indenyl group, a naphthyl group, an        azulenyl group, a heptalenyl group, an indacenyl group, an        acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group,        a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl        group, a phenanthrenyl group, an anthracenyl group, a        fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a        chrysenyl group, a naphthacenyl group, a picenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a rubicenyl group, a coronenyl group, an        ovalenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, and a pyridinyl        group; and    -   a phenyl group, a biphenyl group, a terphenyl group, a        pentalenyl group, an indenyl group, a naphthyl group, an        azulenyl group, a heptalenyl group, an indacenyl group, an        acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group,        a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl        group, a phenanthrenyl group, an anthracenyl group, a        fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a        chrysenyl group, a naphthacenyl group, a picenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a rubicenyl group, a coronenyl group, an        ovalenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, and a pyridinyl        group, each substituted with at least one selected from        deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a        cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a        cyclopentenyl group, a cyclohexenyl group, a phenyl group, a        biphenyl group, a terphenyl group, a phenyl group substituted        with a C₁-C₁₀ alkyl group, a phenyl group substituted with —F, a        pentalenyl group, an indenyl group, a naphthyl group, an        azulenyl group, a heptalenyl group, an indacenyl group, an        acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group,        a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl        group, a phenanthrenyl group, an anthracenyl group, a        fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a        chrysenyl group, a naphthacenyl group, a picenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a rubicenyl group, a coronenyl group, an        ovalenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, —Si(Q₃₁)(Q₃₂)(Q₃₃), and —N(Q₃₁)(Q₃₂), and    -   Q₃₁ to Q₃₃ are the same as described herein above.

In one or more embodiments, at least one selected from R₂₀₁ to R₂₀₃ inFormula 201 may each independently be selected from:

-   -   a fluorenyl group, a spiro-bifluorenyl group, a carbazolyl        group, a dibenzofuranyl group, and a dibenzothiophenyl group;        and    -   a fluorenyl group, a spiro-bifluorenyl group, a carbazolyl        group, a dibenzofuranyl group, and a dibenzothiophenyl group,        each substituted with at least one selected from deuterium, —F,        —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an        amidino group, a hydrazino group, a hydrazono group, a C₁-C₂₀        alkyl group, a C₁-C₂₀ alkoxy group, a cyclopentyl group, a        cyclohexyl group, a cycloheptyl group, a cyclopentenyl group, a        cyclohexenyl group, a phenyl group, a biphenyl group, a        terphenyl group, a phenyl group substituted with a C₁-C₁₀ alkyl        group, a phenyl group substituted with —F, a naphthyl group, a        fluorenyl group, a spiro-bifluorenyl group, a carbazolyl group,        a dibenzofuranyl group, and a dibenzothiophenyl group,    -   but embodiments of the present disclosure are not limited        thereto.

In one or more embodiments, in Formula 202, i) R₂₀₁ and R₂₀₂ may belinked via a single bond, and/or ii) R₂₀₃ and R₂₀₄ may be linked via asingle bond.

In one or more embodiments, at least one selected from R₂₀₁ to R₂₀₄ inFormula 202 may be selected from:

-   -   a carbazolyl group; and    -   a carbazolyl group substituted with at least one selected from        deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a        cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a        cyclopentenyl group, a cyclohexenyl group, a phenyl group, a        biphenyl group, a terphenyl group, a phenyl group substituted        with a C₁-C₁₀ alkyl group, a phenyl group substituted with —F, a        naphthyl group, a fluorenyl group, a spiro-bifluorenyl group, a        carbazolyl group, a dibenzofuranyl group, and a        dibenzothiophenyl group,    -   but embodiments of the present disclosure are not limited        thereto.

In one embodiment, the compound represented by Formula 201 may berepresented by Formula 201A:

In one or more embodiments, the compound represented by Formula 201 maybe represented by Formula 201A(1), but embodiments of the presentdisclosure are not limited thereto:

In one or more embodiments, the compound represented by Formula 201 maybe represented by Formula 201A-1, but embodiments of the presentdisclosure are not limited thereto:

In one embodiment, the compound represented by Formula 202 ay berepresented by Formula 202A:

In one or more embodiments, the compound represented by Formula 202 maybe represented by Formula 202A-1:

In Formulae 201A, 201A(1), 201A-1, 202A, and 202A-1,

-   -   L₂₀₁ to L₂₀₃, xa1 to xa3, xa5, and R₂₀₂ to R₂₀₄ are the same as        described herein above,    -   R₂₁₁ and R₂₁₂ may each independently be the same as defined in        connection with R₂₀₃, and    -   R₂₁₃ to R₂₁₇ may each independently be selected from hydrogen,        deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a        cyclopentyl group, a cyclohexyl group, a cycloheptyl group, a        cyclopentenyl group, a cyclohexenyl group, a phenyl group, a        biphenyl group, a terphenyl group, a phenyl group substituted        with a C₁-C₁₀ alkyl group, a phenyl group substituted with —F, a        pentalenyl group, an indenyl group, a naphthyl group, an        azulenyl group, a heptalenyl group, an indacenyl group, an        acenaphthyl group, a fluorenyl group, a spiro-bifluorenyl group,        a benzofluorenyl group, a dibenzofluorenyl group, a phenalenyl        group, a phenanthrenyl group, an anthracenyl group, a        fluoranthenyl group, a triphenylenyl group, a pyrenyl group, a        chrysenyl group, a naphthacenyl group, a picenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a rubicenyl group, a coronenyl group, an        ovalenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, and a pyridinyl        group.

The hole transport region may include at least one selected fromCompounds HT1 to HT39, but embodiments of the present disclosure are notlimited thereto:

A thickness of the hole transport region may be from about 100 Å toabout 10,000 Å, for example, about 100 Å to about 3,000 Å. When the holetransport region includes at least one selected from a hole injectionlayer and a hole transport layer, a thickness of the hole injectionlayer may be in a range of about 100 Å to about 9,000 Å, for example,about 100 Å to about 1,000 Å, and a thickness of the hole transportlayer may be in a range of about 50 Å to about 2,000 Å, for exampleabout 100 Å to about 1,500 Å. When the thicknesses of the hole transportregion, the hole injection layer, and the hole transport layer arewithin these ranges, suitable or satisfactory hole transportingcharacteristics may be obtained without a substantial increase indriving voltage.

The emission auxiliary layer may increase light-emission efficiency bycompensating for an optical resonance distance according to thewavelength of light emitted by an emission layer, and the electronblocking layer may block or reduce the flow of electrons from anelectron transport region. The emission auxiliary layer and the electronblocking layer may include the materials as described herein above.

p-Dopant

The hole transport region may further include, in addition to thesematerials, a charge-generation material for the improvement ofconductive properties. The charge-generation material may behomogeneously or non-homogeneously dispersed in the hole transportregion.

The charge-generation material may be, for example, a p-dopant.

In one embodiment, the p-dopant may have a lowest unoccupied molecularorbital (LUMO) energy level of about −3.5 eV or less.

The p-dopant may include at least one selected from a quinonederivative, a metal oxide, and a cyano group-containing compound, butembodiments of the present disclosure are not limited thereto.

In one embodiment, the p-dopant may include at least one selected from:

-   -   a quinone derivative, such as tetracyanoquinodimethane (TCNQ)        and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane        (F4-TCNQ);    -   a metal oxide, such as tungsten oxide or molybdenum oxide;    -   1,4,5,8,9,12-hexaazatriphenylene-hexacarbonitrile (HAT-CN); and    -   a compound represented by Formula 221:

-   -   but embodiments of the present disclosure are not limited        thereto.

In Formula 221,

-   -   R₂₂₁ to R₂₂₃ may each independently be selected from a        substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, a        substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or        unsubstituted C₁-C₆₀ heteroaryl group, a substituted or        unsubstituted monovalent non-aromatic condensed polycyclic        group, and a substituted or unsubstituted monovalent        non-aromatic condensed heteropolycyclic group, wherein at least        one selected from R₂₂₁ to R₂₂₃ may have at least one substituent        selected from a cyano group, —F, —Cl, —Br, —I, a C₁-C₂₀ alkyl        group substituted with —F, a C₁-C₂₀ alkyl group substituted with        —Cl, a C₁-C₂₀ alkyl group substituted with —Br, and a C₁-C₂₀        alkyl group substituted with —I.        Emission Layer in Organic Layer 150

When the organic light-emitting device 10 is a full-color organiclight-emitting device, the emission layer may be patterned into a redemission layer, a green emission layer, and a blue emission layer. Inone or more embodiments, the emission layer may have a stacked structureof two or more layers selected from a red emission layer, a greenemission layer, and a blue emission layer, in which the two or morelayers contact each other or are separated from each other. In one ormore embodiments, the emission layer may include two or more materialsselected from a red light-emitting material, a green light-emittingmaterial, and a blue light-emitting material, in which the two or morematerials are mixed with each other in a single layer to emit whitelight.

The emission layer may include the compound of Formula 1 according to anembodiment.

In one embodiment, the compound represented by Formula 1 may be a hostor a dopant.

In one embodiment, the emission layer may further include, in additionto the compound represented by Formula 1, a host and a dopant. Thedopant may include at least one selected from a phosphorescent dopantand a fluorescent dopant.

In the emission layer, an amount of the dopant may be in a range ofabout 0.01 parts by weight to about 15 parts by weight based on the 100parts by weight of the host, but embodiments of the present disclosureare not limited thereto.

A thickness of the emission layer may be in a range of about 100 Å toabout 1,000 Å, for example, about 200 Å to about 600 Å. When thethickness of the emission layer is within this range, excellentlight-emission characteristics may be obtained without a substantialincrease in driving voltage.

Host in Emission Layer

The host may include the compound represented by Formula 1 according toan embodiment.

The host may further include, in addition to the compound represented byFormula 1 according to an embodiment, a compound represented by Formula301:[Ar₃₀₁]_(xb11)−[(L₃₀₁)_(xb1)−R₃₀₁]_(xb21)  Formula 301

In Formula 301,

-   -   Ar₃₀₁ may be a substituted or unsubstituted C₅-C₆₀ carbocyclic        group or a substituted or unsubstituted C₁-C₆₀ heterocyclic        group,    -   xb11 may be 1, 2, or 3,    -   L₃₀₁ may be selected from a substituted or unsubstituted C₃-C₁₀        cycloalkylene group, a substituted or unsubstituted C₁-C₁₀        heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀        cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀        heterocycloalkenylene group, a substituted or unsubstituted        C₆-C₆₀ arylene group, a substituted or unsubstituted C₁-C₆₀        heteroarylene group, a substituted or unsubstituted divalent        non-aromatic condensed polycyclic group, and a substituted or        unsubstituted divalent non-aromatic condensed heteropolycyclic        group,    -   xb1 may be an integer from 0 to 5,    -   R₃₀₁ may be selected from deuterium, —F, —Cl, —Br, —I, a        hydroxyl group, a cyano group, a nitro group, an amidino group,        a hydrazino group, a hydrazono group, a substituted or        unsubstituted C₁-C₆₀ alkyl group, a substituted or unsubstituted        C₂-C₆₀ alkenyl group, a substituted or unsubstituted C₂-C₆₀        alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxy        group, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, a        substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or        unsubstituted C₆-C₆₀ aryloxy group, a substituted or        unsubstituted C₆-C₆₀ arylthio group, a substituted or        unsubstituted C₁-C₆₀ heteroaryl group, a substituted or        unsubstituted monovalent non-aromatic condensed polycyclic        group, a substituted or unsubstituted monovalent non-aromatic        condensed heteropolycyclic group, —Si(Q₃₀₁)(Q₃₀₂)(Q₃₀₃),        —N(Q₃₀₁)(Q₃₀₂), —B(Q₃₀₁)(Q₃₀₂), —C(═O)(Q₃₀₁), —S(═O)₂(Q₃₀₁), and        —P(═O)(Q₃₀₁)(Q₃₀₂),    -   xb21 may be an integer from 1 to 5, and    -   Q₃₀₁ to Q₃₀₃ may each independently be selected from a C₁-C₁₀        alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl        group, a terphenyl group, and a naphthyl group, but embodiments        of the present disclosure are not limited thereto.

In one embodiment, Ar₃₀₁ in Formula 301 may be selected from:

-   -   a naphthalene group, a fluorene group, a spiro-bifluorene group,        a benzofluorene group, a dibenzofluorene group, a phenalene        group, a phenanthrene group, an anthracene group, a fluoranthene        group, a triphenylene group, a pyrene group, a chrysene group, a        naphthacene group, a picene group, a perylene group, a        pentaphene group, an indenoanthracene group, a dibenzofuran        group, and a dibenzothiophene group; and    -   a naphthalene group, a fluorene group, a spiro-bifluorene group,        a benzofluorene group, a dibenzofluorene group, a phenalene        group, a phenanthrene group, an anthracene group, a fluoranthene        group, a triphenylene group, a pyrene group, a chrysene group, a        naphthacene group, a picene group, a perylene group, a        pentaphene group, an indenoanthracene group, a dibenzofuran        group, and a dibenzothiophene group, each substituted with at        least one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl        group, a cyano group, a nitro group, an amidino group, a        hydrazino group, a hydrazono group, a C₁-C₂₀ alkyl group, a        C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, a        terphenyl group, a naphthyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃),        —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and        —P(═O)(Q₃₁)(Q₃₂), and    -   Q₃₁ to Q₃₃ may each independently be selected from a C₁-C₁₀        alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl        group, a terphenyl group, and a naphthyl group, but embodiments        of the present disclosure are not limited thereto.

When xb11 in Formula 301 is two or more, two or more Ar₃₀₁(s) may belinked via a single bond.

In one or more embodiments, the compound represented by Formula 301 maybe represented by Formula 301-1 or 301-2:

In Formulae 301-1 to 301-2,

-   -   A₃₀₁ to A₃₀₄ may each independently be selected from a benzene        ring, a naphthalene ring, a phenanthrene ring, a fluoranthene        ring, a triphenylene ring, a pyrene ring, a chrysene ring, a        pyridine ring, a pyrimidine ring, an indene ring, a fluorene        ring, a spiro-bifluorene ring, a benzofluorene ring, a        dibenzofluorene ring, an indole ring, a carbazole ring, a        benzocarbazole ring, a dibenzocarbazole ring, a furan ring, a        benzofuran ring, a dibenzofuran ring, a naphthofuran ring, a        benzonaphthofuran ring, a dinaphthofuran ring, a thiophene ring,        a benzothiophene ring, a dibenzothiophene ring, a        naphthothiophene ring, a benzonaphthothiophene group, and a        dinaphthothiophene group ring,    -   X₃₀₁ may be O, S, or N-[(L₃₀₄)_(xb4)-R₃₀₄],    -   R₃₁₁ to R₃₁₄ may each independently be selected from hydrogen,        deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl        group, a biphenyl group, a terphenyl group, a naphthyl group        —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁) (Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁),        —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),    -   xb22 and xb23 may each independently be 0, 1, or 2,    -   L₃₀₁, xb1, R₃₀₁, and Q₃₁ to Q₃₃ are the same as described herein        above,    -   L₃₀₂ to L₃₀₄ may each independently be the same as defined in        connection with L₃₀₁,    -   xb2 to xb4 may each independently be the same as defined in        connection with xb1, and    -   R₃₀₂ to R₃₀₄ may each independently be the same as defined in        connection with R₃₀₁.

For example, in Formulae 301, 301-1, and 301-2, L₃₀₁ to L₃₀₄ may eachindependently be selected from:

-   -   a phenylene group, a naphthylene group, a fluorenylene group, a        spiro-bifluorenylene group, a benzofluorenylene group, a        dibenzofluorenylene group, a phenanthrenylene group, an        anthracenylene group, a fluoranthenylene group, a        triphenylenylene group, a pyrenylene group, a chrysenylene        group, a perylenylene group, a pentaphenylene group, a        hexacenylene group, a pentacenylene group, a thiophenylene        group, a furanylene group, a carbazolylene group, an indolylene        group, an isoindolylene group, a benzofuranylene group, a        benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, a        pyridinylene group, an imidazolylene group, a pyrazolylene        group, a thiazolylene group, an isothiazolylene group, an        oxazolylene group, an isooxazolylene group, a thiadiazolylene        group, an oxadiazolylene group, a pyrazinylene group, a        pyrimidinylene group, a pyridazinylene group, a triazinylene        group, a quinolinylene group, an isoquinolinylene group, a        benzoquinolinylene group, a phthalazinylene group, a        naphthyridinylene group, a quinoxalinylene group, a        quinazolinylene group, a cinnolinylene group, a        phenanthridinylene group, an acridinylene group, a        phenanthrolinylene group, a phenazinylene group, a        benzimidazolylene group, an isobenzothiazolylene group, a        benzoxazolylene group, an isobenzoxazolylene group, a        triazolylene group, a tetrazolylene group, an        imidazopyridinylene group, an imidazopyrimidinylene group, and        an azacarbazolylene group; and    -   a phenylene group, a naphthylene group, a fluorenylene group, a        spiro-bifluorenylene group, a benzofluorenylene group, a        dibenzofluorenylene group, a phenanthrenylene group, an        anthracenylene group, a fluoranthenylene group, a        triphenylenylene group, a pyrenylene group, a chrysenylene        group, a perylenylene group, a pentaphenylene group, a        hexacenylene group, a pentacenylene group, a thiophenylene        group, a furanylene group, a carbazolylene group, an indolylene        group, an isoindolylene group, a benzofuranylene group, a        benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, a        pyridinylene group, an imidazolylene group, a pyrazolylene        group, a thiazolylene group, an isothiazolylene group, an        oxazolylene group, an isooxazolylene group, a thiadiazolylene        group, an oxadiazolylene group, a pyrazinylene group, a        pyrimidinylene group, a pyridazinylene group, a triazinylene        group, a quinolinylene group, an isoquinolinylene group, a        benzoquinolinylene group, a phthalazinylene group, a        naphthyridinylene group, a quinoxalinylene group, a        quinazolinylene group, a cinnolinylene group, a        phenanthridinylene group, an acridinylene group, a        phenanthrolinylene group, a phenazinylene group, a        benzimidazolylene group, an isobenzothiazolylene group, a        benzoxazolylene group, an isobenzoxazolylene group, a        triazolylene group, a tetrazolylene group, an        imidazopyridinylene group, an imidazopyrimidinylene group, and        an azacarbazolylene group, each substituted with at least one        selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a        cyano group, a nitro group, an amidino group, a hydrazino group,        a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group,        a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, an        azacarbazolyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂),        —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),        and    -   Q₃₁ to Q₃₃ are the same as described herein above.

In one embodiment, R₃₀₁ to R₃₀₄ in Formulae 301, 301-1, and 301-2 mayeach independently be selected from:

-   -   a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, and an        azacarbazolyl group; and    -   a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, and an        azacarbazolyl group, each substituted with at least one selected        from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano        group, a nitro group, an amidino group, a hydrazino group, a        hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a        phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, an        azacarbazolyl group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂),        —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),        and    -   Q₃₁ to Q₃₃ are the same as described herein above.

In one or more embodiments, the host may include an alkaline earth metalcomplex. For example, the host may be selected from a Be complex (forexample, Compound H55), a Mg complex, and a Zn complex.

The host may be at least one selected from9,10-di(2-naphthyl)anthracene) (ADN),2-methyl-9,10-bis(naphthalen-2-yl)anthracene (MADN),9,10-di-(2-naphthyl)-2-t-butyl-anthracene (TBADN),4,4′-bis(N-carbazolyl)-1,1′-biphenyl (CBP), 1,3-di-9-carbazolylbenzene(mCP), 1,3,5-tri(carbazol-9-yl)benzene (TCP), and Compounds H1 to H55,but embodiments of the present disclosure are not limited thereto:

[Phosphorescent Dopant in Emission Layer of Organic Layer 150]

The phosphorescent dopant may include an organometallic complexrepresented by Formula 401:

In Formulae 401 and 402,

-   -   M may be selected from iridium (Ir), platinum (Pt), palladium        (Pd), osmium (Os), titanium (Ti), zirconium (Zr), hafnium (Hf),        europium (Eu), terbium (Tb), rhodium (Rh), and thulium (Tm),    -   L₄₀₁ may be selected from ligands represented by Formula 402,        and xc1 may be 1, 2, or 3, wherein, when xc1 is two or more, two        or more L₄₀₁(s) may be identical to or different from each        other,    -   L₄₀₂ may be an organic ligand, and xc2 may be an integer from 0        to 4, wherein, when xc2 is two or more, two or more L₄₀₂(s) may        be identical to or different from each other,    -   X₄₀₁ to X₄₀₄ may each independently be nitrogen or carbon,    -   X₄₀₁ and X₄₀₃ may be linked via a single bond or a double bond,        and X₄₀₂ and X₄₀₄ may be linked via a single bond or a double        bond,

A₄₀₁ and A₄₀₂ may each independently be selected from a C₅-C₆₀carbocyclic group or a C₁-C₆₀ heterocyclic group,

-   -   X₄₀₅ may be a single bond, *—O—*′, *—S—*′, *—C(═O)—*′,        *—N(Q₄₁₁)—*′, *—C(Q₄₁₁)(Q₄₁₂)—*′, *—C(Q₄₁₁)═C(Q₄₁₂)—*′,        *—O(Q₄₁₁)=*′, or *═C═*′, wherein Q₄₁₁ and Q₄₁₂ may each        independently be hydrogen, deuterium, a C₁-C₂₀ alkyl group, a        C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, a        terphenyl group, or a naphthyl group    -   X₄₀₆ may be a single bond, O, or S,    -   R₄₀₁ and R₄₀₂ may each independently be selected from hydrogen,        deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a substituted or unsubstituted C₁-C₂₀ alkyl group, a        substituted or unsubstituted C₁-C₂₀ alkoxy group, a substituted        or unsubstituted C₃-C₁₀ cycloalkyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkyl group, a substituted or        unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted or        unsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted or        unsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted        C₆-C₆₀ aryloxy group, a substituted or unsubstituted C₆-C₆₀        arylthio group, a substituted or unsubstituted C₁-C₆₀ heteroaryl        group, a substituted or unsubstituted monovalent non-aromatic        condensed polycyclic group, and a substituted or unsubstituted        monovalent non-aromatic condensed heteropolycyclic group,        —Si(Q₄₀₁)(Q₄₀₂)(Q₄₀₃), —N(Q₄₀₁)(Q₄₀₂), —B(Q₄₀₁)(Q₄₀₂),        —C(═O)(Q₄₀₁), —S(═O)₂(Q₄₀₁), and —P(═O)(Q₄₀₁)(Q₄₀₂), wherein        Q₄₀₁ to Q₄₀₃ may each independently be selected from a C₁-C₁₀        alkyl group, a C₁-C₁₀ alkoxy group, a C₆-C₂₀ aryl group, and a        C₁-C₂₀ heteroaryl group,    -   xc11 and xc12 may each independently be an integer from 0 to 10,        and    -   and *′ in Formula 402 each indicate a binding site to M in        Formula 401.

In one embodiment, A₄₀₁ and A₄₀₂ in Formula 402 may each independentlybe selected from a benzene group, a naphthalene group, a fluorene group,a spiro-bifluorene group, an indene group, a pyrrole group, a thiophenegroup, a furan group, an imidazole group, a pyrazole group, a thiazolegroup, an isothiazole group, an oxazole group, an isoxazole group, apyridine group, a pyrazine group, a pyrimidine group, a pyridazinegroup, a quinoline group, an isoquinoline group, a benzoquinoline group,a quinoxaline group, a quinazoline group, a carbazole group, abenzimidazole group, a benzofuran group, a benzothiophene group, anisobenzothiophene group, a benzoxazole group, an isobenzoxazole group, atriazole group, a tetrazole group, an oxadiazole group, a triazinegroup, a dibenzofuran group, and a dibenzothiophene group.

In one or more embodiments, in Formula 402, i) X₄₀₁ may be nitrogen, andX₄₀₂ may be carbon, or ii) X₄₀₁ and X₄₀₂ may each be nitrogen at thesame time.

In one or more embodiments, R₄₀₁ and R₄₀₂ in Formula 402 may eachindependently be selected from:

-   -   hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano        group, a nitro group, an amidino group, a hydrazino group, a        hydrazono group, a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy        group;    -   a C₁-C₂₀ alkyl group, and a C₁-C₂₀ alkoxy group, each        substituted with at least one selected from deuterium, —F, —Cl,        —Br, —I, a hydroxyl group, a cyano group, a nitro group, an        amidino group, a hydrazino group, a hydrazono group, a phenyl        group, a naphthyl group, a cyclopentyl group, a cyclohexyl        group, an adamantanyl group, a norbornanyl group, and a        norbornenyl group;    -   a cyclopentyl group, a cyclohexyl group, an adamantanyl group, a        norbornanyl group, a norbornenyl group, a phenyl group, a        biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl        group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl        group, a pyridazinyl group, a triazinyl group, a quinolinyl        group, an isoquinolinyl group, a quinoxalinyl group, a        quinazolinyl group, a carbazolyl group, a dibenzofuranyl group,        and a dibenzothiophenyl group;    -   a cyclopentyl group, a cyclohexyl group, an adamantanyl group, a        norbornanyl group, a norbornenyl group a phenyl group, a        biphenyl group, a terphenyl group, a naphthyl group, a fluorenyl        group, a pyridinyl group, a pyrazinyl group, a pyrimidinyl        group, a pyridazinyl group, a triazinyl group, a quinolinyl        group, an isoquinolinyl group, a quinoxalinyl group, a        quinazolinyl group, a carbazolyl group, a dibenzofuranyl group,        and a dibenzothiophenyl group, each substituted with at least        one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amidino group, a hydrazino        group, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy        group, a cyclopentyl group, a cyclohexyl group, an adamantanyl        group, a norbornanyl group, a norbornenyl group, a phenyl group,        a biphenyl group, a terphenyl group, a naphthyl group, a        fluorenyl group, a pyridinyl group, a pyrazinyl group, a        pyrimidinyl group, a pyridazinyl group, a triazinyl group, a        quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,        a quinazolinyl group, a carbazolyl group, a dibenzofuranyl        group, and a dibenzothiophenyl group; and    -   —Si(Q₄₀₁)(Q₄₀₂)(Q₄₀₃), —N(Q₄₀₁)(Q₄₀₂), —B(Q₄₀₁)(Q₄₀₂),        —C(═O)(Q₄₀₁), —S(═O)₂(Q₄₀₁), and —P(═O)(Q₄₀₁)(Q₄₀₂), and    -   Q₄₀₁ to Q₄₀₃ may each independently be selected from a C₁-C₁₀        alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl        group, and a naphthyl group, but embodiments of the present        disclosure are not limited thereto.

In one or more embodiments, when xc1 in Formula 401 is two or more, twoA₄₀₁(S) in two or more L₄₀₁(s) may optionally be linked via X₄₀₇, whichis a linking group, or two A₄₀₂(S) in two or more L₄₀₁(s) may optionallybe linked via X₄₀₈, which is a linking group (see Compounds PD1 to PD4and PD7). X₄₀₇ and X₄₀₈ may each independently be a single bond, *—O—*′,*—S—*′, *—C(═O)—*′, *—N(Q₄₁₃)—*′, *—C(Q₄₁₃)(Q₄₁₄)—*′, or*—C(Q₄₁₃)═C(Q₄₁₄)—*′ (wherein Q₄₁₃ and Q₄₁₄ may each independently behydrogen, deuterium, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, aphenyl group, a biphenyl group, a terphenyl group, or a naphthyl group),but are not limited thereto.

L₄₀₂ in Formula 401 may be a monovalent, divalent, or trivalent organicligand. For example, L₄₀₂ may be selected from halogen, diketone (forexample, acetylacetonate), carboxylic acid (for example, picolinate),—C(═O), isonitrile, —CN, and phosphorus (for example, phosphine, orphosphite), but embodiments of the present disclosure are not limitedthereto.

In one or more embodiments, the phosphorescent dopant may be selectedfrom, for example, Compounds PD1 to PD25, but embodiments of the presentdisclosure are not limited thereto:

Fluorescent Dopant in Emission Layer

The fluorescent dopant may include an arylamine compound or astyrylamine compound.

The fluorescent dopant may include a compound represented by Formula501:

In Formula 501,

-   -   Ar₅₀₁ may be a substituted or unsubstituted C₅-C₆₀ carbocyclic        group or a substituted or unsubstituted C₁-C₆₀ heterocyclic        group,    -   L₅₀₁ to L₅₀₃ may each independently be selected from a        substituted or unsubstituted C₃-C₁₀ cycloalkylene group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkylene group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenylene group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenylene group,        a substituted or unsubstituted C₆-C₆₀ arylene group, a        substituted or unsubstituted C₁-C₆₀ heteroarylene group, a        substituted or unsubstituted divalent non-aromatic condensed        polycyclic group, and a substituted or unsubstituted divalent        non-aromatic condensed heteropolycyclic group,    -   xd1 to xd3 may each independently be an integer from 0 to 3,    -   R₅₀₁ and R₅₀₂ may each independently be selected from a        substituted or unsubstituted C₃-C₁₀ cycloalkyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, a        substituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a        substituted or unsubstituted C₁-C₁₀ heterocycloalkenyl group, a        substituted or unsubstituted C₆-C₆₀ aryl group, a substituted or        unsubstituted C₆-C₆₀ aryloxy group, a substituted or        unsubstituted C₆-C₆₀ arylthio group, a substituted or        unsubstituted C₁-C₆₀ heteroaryl group, a substituted or        unsubstituted monovalent non-aromatic condensed polycyclic        group, and a substituted or unsubstituted monovalent        non-aromatic condensed heteropolycyclic group, and    -   xd4 may be an integer from 1 to 6.

In one embodiment, Ar₅₀₁ in Formula 501 may be selected from:

-   -   a naphthalene group, a heptalene group, a fluorene group, a        spiro-bifluorene group, a benzofluorene group, a dibenzofluorene        group, a phenalene group, a phenanthrene group, an anthracene        group, a fluoranthene group, a triphenylene group, a pyrene        group, a chrysene group, a naphthacene group, a picene group, a        perylene group, a pentaphene group, an indenoanthracene group,        and an indenophenanthrene group; and    -   a naphthalene group, a heptalene group, a fluorene group, a        spiro-bifluorene group, a benzofluorene group, a dibenzofluorene        group, a phenalene group, a phenanthrene group, an anthracene        group, a fluoranthene group, a triphenylene group, a pyrene        group, a chrysene group, a naphthacene group, a picene group, a        perylene group, a pentaphene group, an indenoanthracene group,        and an indenophenanthrene group, each substituted with at least        one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amidino group, a hydrazino        group, a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy        group, a phenyl group, a biphenyl group, a terphenyl group, and        a naphthyl group.

In one or more embodiments, L₅₀₁ to L₅₀₃ in Formula 501 may eachindependently be selected from:

-   -   a phenylene group, a naphthylene group, a fluorenylene group, a        spiro-bifluorenylene group, a benzofluorenylene group, a        dibenzofluorenylene group, a phenanthrenylene group, an        anthracenylene group, a fluoranthenylene group, a        triphenylenylene group, a pyrenylene group, a chrysenylene        group, a perylenylene group, a pentaphenylene group, a        hexacenylene group, a pentacenylene group, a thiophenylene        group, a furanylene group, a carbazolylene group, an indolylene        group, an isoindolylene group, a benzofuranylene group, a        benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, and a        pyridinylene group; and    -   a phenylene group, a naphthylene group, a fluorenylene group, a        spiro-bifluorenylene group, a benzofluorenylene group, a        dibenzofluorenylene group, a phenanthrenylene group, an        anthracenylene group, a fluoranthenylene group, a        triphenylenylene group, a pyrenylene group, a chrysenylene        group, a perylenylene group, a pentaphenylene group, a        hexacenylene group, a pentacenylene group, a thiophenylene        group, a furanylene group, a carbazolylene group, an indolylene        group, an isoindolylene group, a benzofuranylene group, a        benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, and a        pyridinylene group, each substituted with at least one selected        from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano        group, a nitro group, an amidino group, a hydrazino group, a        hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a        phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, and a pyridinyl        group.

In one or more embodiments, R₅₀₁ and R₅₀₂ in Formula 501 may eachindependently be selected from:

-   -   a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, and a pyridinyl        group; and    -   a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, and a pyridinyl        group, each substituted with at least one selected from        deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl        group, a biphenyl group, a terphenyl group, a naphthyl group, a        fluorenyl group, a spiro-bifluorenyl group, a benzofluorenyl        group, a dibenzofluorenyl group, a phenanthrenyl group, an        anthracenyl group, a fluoranthenyl group, a triphenylenyl group,        a pyrenyl group, a chrysenyl group, a perylenyl group, a        pentaphenyl group, a hexacenyl group, a pentacenyl group, a        thiophenyl group, a furanyl group, a carbazolyl group, an        indolyl group, an isoindolyl group, a benzofuranyl group, a        benzothiophenyl group, a dibenzofuranyl group, a        dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, and —Si(Q₃₁)(Q₃₂)(Q₃₃), and    -   Q₃₁ to Q₃₃ may each independently be selected from a C₁-C₁₀        alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl        group, a terphenyl group, and a naphthyl group.

In one or more embodiments, xd4 in Formula 501 may be 2, but embodimentsof the present disclosure are not limited thereto.

For example, the fluorescent dopant may be selected from Compounds FD1to FD22:

In one or more embodiments, the fluorescent dopant may be selected fromthe following compounds, but embodiments of the present disclosure arenot limited thereto:

Electron Transport Region in Organic Layer 150

The electron transport region may have i) a single-layered structureincluding a single layer including a single material, ii) asingle-layered structure including a single layer including a pluralityof different materials, or iii) a multi-layered structure having aplurality of layers including a plurality of different materials.

The electron transport region may include at least one selected from abuffer layer, a hole blocking layer, an electron control layer, anelectron transport layer, and an electron injection layer, butembodiments of the present disclosure are not limited thereto.

For example, the electron transport region may have an electrontransport layer/electron injection layer structure, a hole blockinglayer/electron transport layer/electron injection layer structure, anelectron control layer/electron transport layer/electron injection layerstructure, or a buffer layer/electron transport layer/electron injectionlayer structure, wherein for each structure, constituting layers aresequentially stacked from an emission layer. However, embodiments of thestructure of the electron transport region are not limited thereto.

The electron transport region (for example, a buffer layer, a holeblocking layer, an electron control layer, or an electron transportlayer in the electron transport region) may include a metal-freecompound containing at least one π electron-depleted nitrogen-containingring.

The term “π electron-depleted nitrogen-containing ring,” as used herein,indicates a C₁-C₆₀ heterocyclic group having at least one *—N═*′ moietyas a ring-forming moiety.

For example, the “π electron-depleted nitrogen-containing ring” may bei) a 5-membered to 7-membered heteromonocyclic group having at least one*—N═*′ moiety, ii) a heteropolycyclic group in which two or more5-membered to 7-membered heteromonocyclic groups each having at leastone *—N═*′ moiety are condensed with each other (e.g., combinedtogether), or iii) a heteropolycyclic group in which at least one of5-membered to 7-membered heteromonocyclic groups, each having at leastone *—N═*′ moiety, is condensed with at least one C₅-C₆₀ carbocyclicgroup.

Examples of the π electron-depleted nitrogen-containing ring include animidazole, a pyrazole, a thiazole, an isothiazole, an oxazole, anisoxazole, a pyridine, a pyrazine, a pyrimidine, a pyridazine, anindazole, a purine, a quinoline, an isoquinoline, a benzoquinoline, aphthalazine, a naphthyridine, a quinoxaline, a quinazoline, a cinnoline,a phenanthridine, an acridine, a phenanthroline, a phenazine, abenzimidazole, an isobenzothiazole, a benzoxazole, an isobenzoxazole, atriazole, a tetrazole, an oxadiazole, a triazine, a thiadiazole, animidazopyridine, an imidazopyrimidine, and an azacarbazole, but are notlimited thereto.

For example, the electron transport region may include a compoundrepresented by Formula 601:[Ar₆₀₁]_(xe11)−[(L₆₀₁)_(xe1)−R₆₀₁]_(xe21)  Formula 601

In Formula 601,

-   -   Ar₆₀₁ may be a substituted or unsubstituted C₅-C₆₀ carbocyclic        group or a substituted or unsubstituted C₁-C₆₀ heterocyclic        group,    -   xe11 may be 1, 2, or 3,    -   L₆₀₁ may be selected from a substituted or unsubstituted C₃-C₁₀        cycloalkylene group, a substituted or unsubstituted C₁-C₁₀        heterocycloalkylene group, a substituted or unsubstituted C₃-C₁₀        cycloalkenylene group, a substituted or unsubstituted C₁-C₁₀        heterocycloalkenylene group, a substituted or unsubstituted        C₆-C₆₀ arylene group, a substituted or unsubstituted C₁-C₆₀        heteroarylene group, a substituted or unsubstituted divalent        non-aromatic condensed polycyclic group, and a substituted or        unsubstituted divalent non-aromatic condensed heteropolycyclic        group;    -   xe1 may be an integer from 0 to 5,    -   R₆₀₁ may be selected from a substituted or unsubstituted C₃-C₁₀        cycloalkyl group, a substituted or unsubstituted C₁-C₁₀        heterocycloalkyl group, a substituted or unsubstituted C₃-C₁₀        cycloalkenyl group, a substituted or unsubstituted C₁-C₁₀        heterocycloalkenyl group, a substituted or unsubstituted C₆-C₆₀        aryl group, a substituted or unsubstituted C₆-C₆₀ aryloxy group,        a substituted or unsubstituted C₆-C₆₀ arylthio group, a        substituted or unsubstituted C₁-C₆₀ heteroaryl group, a        substituted or unsubstituted monovalent non-aromatic condensed        polycyclic group, a substituted or unsubstituted monovalent        non-aromatic condensed heteropolycyclic group,        —Si(Q₆₀₁)(Q₆₀₂)(Q₆₀₃), —C(═O)(Q₆₀₁), —S(═O)₂(Q₆₀₁), and        —P(═O)(Q₆₀₁)(Q₆₀₂),    -   Q₆₀₁ to Q₆₀₃ may each independently be a C₁-C₁₀ alkyl group, a        C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl group, a        terphenyl group, or a naphthyl group, and    -   xe21 may be an integer from 1 to 5.

In one embodiment, at least one of Ar₆₀₁(S) in the number of xe11 andR₆₀₁(s) in the number of xe21 may include the π electron-depletednitrogen-containing ring.

In one embodiment, ring Ar₆₀₁ in Formula 601 may be selected from:

-   -   a benzene group, a naphthalene group, a fluorene group, a        spiro-bifluorene group, a benzofluorene group, a dibenzofluorene        group, a phenalene group, a phenanthrene group, an anthracene        group, a fluoranthene group, a triphenylene group, a pyrene        group, a chrysene group, a naphthacene group, a picene group, a        perylene group, a pentaphene group, an indenoanthracene group, a        dibenzofuran group, a dibenzothiophene group, a carbazole group,        an imidazole group, a pyrazole group, a thiazole group, an        isothiazole group, an oxazole group, an isoxazole group, a        pyridine group, a pyrazine group, a pyrimidine group, a        pyridazine group, an indazole group, a purine group, a quinoline        group, an isoquinoline group, a benzoquinoline group, a        phthalazine group, a naphthyridine group, a quinoxaline group, a        quinazoline group, a cinnoline group, a phenanthridine group, an        acridine group, a phenanthroline group, a phenazine group, a        benzimidazole group, an isobenzothiazole group, a benzoxazole        group, an isobenzoxazole group, a triazole group, a tetrazole        group, an oxadiazole group, a triazine group, a thiadiazol        group, an imidazopyridine group, an imidazopyrimidine group, and        an azacarbazole group; and    -   a benzene group, a naphthalene group, a fluorene group, a        spiro-bifluorene group, a benzofluorene group, a dibenzofluorene        group, a phenalene group, a phenanthrene group, an anthracene        group, a fluoranthene group, a triphenylene group, a pyrene        group, a chrysene group, a naphthacene group, a picene group, a        perylene group, a pentaphene group, an indenoanthracene group, a        dibenzofuran group, a dibenzothiophene group, a carbazole group,        an imidazole group, a pyrazole group, a thiazole group, an        isothiazole group, an oxazole group, an isoxazole group, a        pyridine group, a pyrazine group, a pyrimidine group, a        pyridazine group, an indazole group, a purine group, a quinoline        group, an isoquinoline group, a benzoquinoline group, a        phthalazine group, a naphthyridine group, a quinoxaline group, a        quinazoline group, a cinnoline group, a phenanthridine group, an        acridine group, a phenanthroline group, a phenazine group, a        benzimidazole group, an isobenzothiazole group, a benzoxazole        group, an isobenzoxazole group, a triazole group, a tetrazole        group, an oxadiazole group, a triazine group, a thiadiazole        group, an imidazopyridine group, an imidazopyrimidine group, and        an azacarbazole group, each substituted with at least one        selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a        cyano group, a nitro group, an amidino group, a hydrazino group,        a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group,        a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, —Si(Q₃₁)(Q₃₂)(Q₃₃), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂),        and    -   Q₃₁ to Q₃₃ may each independently be selected from a C₁-C₁₀        alkyl group, a C₁-C₁₀ alkoxy group, a phenyl group, a biphenyl        group, a terphenyl group, and a naphthyl group.

When xe11 in Formula 601 is two or more, two or more Ar₆₀₁(S) may belinked via a single bond.

In one or more embodiments, Ar₆₀₁ in Formula 601 may be an anthracenegroup.

In one or more embodiments, the compound represented by Formula 601 maybe represented by Formula 601-1:

In Formula 601-1,

-   -   X₆₁₄ may be N or C(R₆₁₄), X₆₁₅ may be N or C(R₆₁₅), and X₆₁₆ may        be N or C(R₆₁₆), wherein at least one selected from X₆₁₄ to X₆₁₆        may be N,    -   L₆₁₁ to L₆₁₃ may each independently be the same as defined in        connection with L₆₀₁,    -   xe611 to xe613 may each independently be the same as defined in        connection with xe1,    -   R₆₁₁ to R₆₁₃ may each independently be the same as defined in        connection with R₆₀₁,    -   R₆₁₄ to R₆₁₆ may each independently be selected from hydrogen,        deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a phenyl        group, a biphenyl group, a terphenyl group, and a naphthyl        group.

In one embodiment, L₆₀₁ and L₆₁₁ to L₆₁₃ in Formulae 601 and 601-1 mayeach independently be selected from:

-   -   a phenylene group, a naphthylene group, a fluorenylene group, a        spiro-bifluorenylene group, a benzofluorenylene group, a        dibenzofluorenylene group, a phenanthrenylene group, an        anthracenylene group, a fluoranthenylene group, a        triphenylenylene group, a pyrenylene group, a chrysenylene        group, a perylenylene group, a pentaphenylene group, a        hexacenylene group, a pentacenylene group, a thiophenylene        group, a furanylene group, a carbazolylene group, an indolylene        group, an isoindolylene group, a benzofuranylene group, a        benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, a        pyridinylene group, an imidazolylene group, a pyrazolylene        group, a thiazolylene group, an isothiazolylene group, an        oxazolylene group, an isooxazolylene group, a thiadiazolylene        group, an oxadiazolylene group, a pyrazinylene group, a        pyrimidinylene group, a pyridazinylene group, a triazinylene        group, a quinolinylene group, an isoquinolinylene group, a        benzoquinolinylene group, a phthalazinylene group, a        naphthyridinylene group, a quinoxalinylene group, a        quinazolinylene group, a cinnolinylene group, a        phenanthridinylene group, an acridinylene group, a        phenanthrolinylene group, a phenazinylene group, a        benzimidazolylene group, an isobenzothiazolylene group, a        benzoxazolylene group, an isobenzoxazolylene group, a        triazolylene group, a tetrazolylene group, an        imidazopyridinylene group, an imidazopyrimidinylene group, and        an azacarbazolylene group; and    -   a phenylene group, a naphthylene group, a fluorenylene group, a        spiro-bifluorenylene group, a benzofluorenylene group, a        dibenzofluorenylene group, a phenanthrenylene group, an        anthracenylene group, a fluoranthenylene group, a        triphenylenylene group, a pyrenylene group, a chrysenylene        group, a perylenylene group, a pentaphenylene group, a        hexacenylene group, a pentacenylene group, a thiophenylene        group, a furanylene group, a carbazolylene group, an indolylene        group, an isoindolylene group, a benzofuranylene group, a        benzothiophenylene group, a dibenzofuranylene group, a        dibenzothiophenylene group, a benzocarbazolylene group, a        dibenzocarbazolylene group, a dibenzosilolylene group, a        pyridinylene group, an imidazolylene group, a pyrazolylene        group, a thiazolylene group, an isothiazolylene group, an        oxazolylene group, an isooxazolylene group, a thiadiazolylene        group, an oxadiazolylene group, a pyrazinylene group, a        pyrimidinylene group, a pyridazinylene group, a triazinylene        group, a quinolinylene group, an isoquinolinylene group, a        benzoquinolinylene group, a phthalazinylene group, a        naphthyridinylene group, a quinoxalinylene group, a        quinazolinylene group, a cinnolinylene group, a        phenanthridinylene group, an acridinylene group, a        phenanthrolinylene group, a phenazinylene group, a        benzimidazolylene group, an isobenzothiazolylene group, a        benzoxazolylene group, an isobenzoxazolylene group, a        triazolylene group, a tetrazolylene group, an        imidazopyridinylene group, an imidazopyrimidinylene group, and        an azacarbazolylene group, each substituted with at least one        selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a        cyano group, a nitro group, an amidino group, a hydrazino group,        a hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group,        a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, and an        azacarbazolyl group,    -   but embodiments of the present disclosure are not limited        thereto.

In one or more embodiments, xe1 and xe611 to xe613 in Formulae 601 and601-1 may each independently be 0, 1, or 2.

In one or more embodiments, R₆₀₁ and R₆₁₁ to R₆₁₃ in Formulae 601 and601-1 may each independently be selected from:

-   -   a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, and an        azacarbazolyl group;    -   a phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, and an        azacarbazolyl group, each substituted with at least one selected        from deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano        group, a nitro group, an amidino group, a hydrazino group, a        hydrazono group, a C₁-C₂₀ alkyl group, a C₁-C₂₀ alkoxy group, a        phenyl group, a biphenyl group, a terphenyl group, a naphthyl        group, a fluorenyl group, a spiro-bifluorenyl group, a        benzofluorenyl group, a dibenzofluorenyl group, a phenanthrenyl        group, an anthracenyl group, a fluoranthenyl group, a        triphenylenyl group, a pyrenyl group, a chrysenyl group, a        perylenyl group, a pentaphenyl group, a hexacenyl group, a        pentacenyl group, a thiophenyl group, a furanyl group, a        carbazolyl group, an indolyl group, an isoindolyl group, a        benzofuranyl group, a benzothiophenyl group, a dibenzofuranyl        group, a dibenzothiophenyl group, a benzocarbazolyl group, a        dibenzocarbazolyl group, a dibenzosilolyl group, a pyridinyl        group, an imidazolyl group, a pyrazolyl group, a thiazolyl        group, an isothiazolyl group, an oxazolyl group, an isoxazolyl        group, a thiadiazolyl group, an oxadiazolyl group, a pyrazinyl        group, a pyrimidinyl group, a pyridazinyl group, a triazinyl        group, a quinolinyl group, an isoquinolinyl group, a        benzoquinolinyl group, a phthalazinyl group, a naphthyridinyl        group, a quinoxalinyl group, a quinazolinyl group, a cinnolinyl        group, a phenanthridinyl group, an acridinyl group, a        phenanthrolinyl group, a phenazinyl group, a benzimidazolyl        group, an isobenzothiazolyl group, a benzoxazolyl group, an        isobenzoxazolyl group, a triazolyl group, a tetrazolyl group, an        imidazopyridinyl group, an imidazopyrimidinyl group, and an        azacarbazolyl group; and    -   —S(═O)₂(Q₆₀₁) and —P(═O)(Q₆₀₁)(Q₆₀₂),    -   Q₆₀₁ and Q₆₀₂ are the same as described herein above.

The electron transport region may include at least one compound selectedfrom Compounds ET1 to ET36, but embodiments of the present disclosureare not limited thereto:

In one or more embodiments, the electron transport region may include atleast one selected from 2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline(BCP), 4,7-diphenyl-1,10-phenanthroline (Bphen), Alq₃, BAlq,3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazoleTAZ), and NTAZ:

In one embodiment, the electron transport region may include a phosphineoxide-containing compound (for example, TSPO1 used in the followingexamples or the like), but embodiments of the present disclosure are notlimited thereto. In one embodiment, the phosphine oxide-containingcompound may be used in a hole blocking layer in the electron transportregion, but embodiments of the present disclosure are not limitedthereto.

Thicknesses of the buffer layer, the hole blocking layer, and theelectron control layer may each be in a range of about 20 Å to about1,000 Å, for example, about 30 Å to about 300 Å. When the thicknesses ofthe buffer layer, the hole blocking layer, and the electron controllayer are within these ranges, the electron blocking layer may haveexcellent electron blocking characteristics or electron controlcharacteristics without a substantial increase in driving voltage.

A thickness of the electron transport layer may be in a range of about100 Å to about 1,000 Å, for example, about 150 Å to about 500 Å. Whenthe thickness of the electron transport layer is within the rangedescribed herein above, suitable or satisfactory electron transportcharacteristics may be obtained without a substantial increase indriving voltage.

The electron transport region (for example, the electron transport layerin the electron transport region) may further include, in addition tothe materials described herein above, a metal-containing material.

The metal-containing material may include at least one selected fromalkali metal complex and alkaline earth-metal complex. The alkali metalcomplex may include a metal ion selected from a Li ion, a Na ion, a Kion, a Rb ion, and a Cs ion, and the alkaline earth-metal complex mayinclude a metal ion selected from a Be ion, a Mg ion, a Ca ion, a Srion, and a Ba ion. A ligand coordinated with the metal ion of the alkalimetal complex or the alkaline earth-metal complex may be selected from ahydroxy quinoline, a hydroxy isoquinoline, a hydroxy benzoquinoline, ahydroxy acridine, a hydroxy phenanthridine, a hydroxy phenyloxazole, ahydroxy phenylthiazole, a hydroxy diphenyl oxadiazole, a hydroxydiphenylthiadiazole, a hydroxy phenylpyridine, a hydroxyphenylbenzimidazole, a hydroxy phenylbenzothiazole, a bipyridine, aphenanthroline, and a cyclopentadiene, but embodiments of the presentdisclosure are not limited thereto.

For example, the metal-containing material may include a Li complex. TheLi complex may include, for example, Compound ET-D1 (lithium quinolate,LiQ) or ET-D2:

The electron transport region may include an electron injection layerthat facilitates electron injection from the second electrode 190. Theelectron injection layer may directly contact the second electrode 190.

The electron injection layer may have i) a single-layered structureincluding a single layer including a single material, ii) asingle-layered structure including a single layer including a pluralityof different materials, or iii) a multi-layered structure having aplurality of layers including a plurality of different materials.

The electron injection layer may include an alkali metal, an alkalineearth metal, a rare earth metal, an alkali metal compound, an alkalineearth-metal compound, a rare earth metal compound, an alkali metalcomplex, an alkaline earth-metal complex, a rare earth metal complex, orany combinations thereof.

The alkali metal may be selected from Li, Na, K, Rb, and Cs. In oneembodiment, the alkali metal may be Li, Na, or Cs. In one or moreembodiments, the alkali metal may be Li or Cs, but embodiments of thepresent disclosure are not limited thereto.

The alkaline earth metal may be selected from Mg, Ca, Sr, and Ba.

The rare earth metal may be selected from Sc, Y, Ce, Tb, Yb, and Gd.

The alkali metal compound, the alkaline earth-metal compound, and therare earth metal compound may be selected from oxides and halides (forexample, fluorides, chlorides, bromides, or iodides) of the alkalimetal, the alkaline earth-metal, and the rare earth metal.

The alkali metal compound may be selected from alkali metal oxides, suchas Li₂O, Cs₂O, or K₂O, and alkali metal halides, such as LiF, NaF, CsF,KF, LiI, NaI, CsI, or KI. In one embodiment, the alkali metal compoundmay be selected from LiF, Li₂O, NaF, LiI, NaI, CsI, and KI, butembodiments of the present disclosure are not limited thereto.

The alkaline earth-metal compound may be selected from alkalineearth-metal oxides, such as BaO, SrO, CaO, Ba_(x)Sr_(1-x)O (0<x<1), orBa_(x)Ca_(1-x)O (0<x<1). In one embodiment, the alkaline earth-metalcompound may be selected from BaO, SrO, and CaO, but embodiments of thepresent disclosure are not limited thereto.

The rare earth metal compound may be selected from YbF₃, ScF₃, ScO₃,Y₂O₃, Ce₂O₃, GdF₃, and TbF₃. In one embodiment, the rare earth metalcompound may be selected from YbF₃, ScF₃, TbF₃, YbI₃, ScI₃, and TbI₃,but embodiments of the present disclosure are not limited thereto.

The alkali metal complex, the alkaline earth-metal complex, and the rareearth metal complex may include an ion of alkali metal, alkalineearth-metal, and rare earth metal as described herein above, and aligand coordinated with a metal ion of the alkali metal complex, thealkaline earth-metal complex, or the rare earth metal complex may beselected from hydroxy quinoline, hydroxy isoquinoline, hydroxybenzoquinoline, hydroxy acridine, hydroxy phenanthridine, hydroxyphenyloxazole, hydroxy phenylthiazole, hydroxy diphenyl oxadiazole,hydroxy diphenylthiadiazole, hydroxy phenylpyridine, hydroxyphenylbenzimidazole, hydroxy phenylbenzothiazole, bipyridine,phenanthroline, and cyclopentadiene, but embodiments of the presentdisclosure are not limited thereto.

The electron injection layer may consist of an alkali metal, an alkalineearth metal, a rare earth metal, an alkali metal compound, an alkalineearth-metal compound, a rare earth metal compound, an alkali metalcomplex, an alkaline earth-metal complex, a rare earth metal complex, orany combinations thereof, as described herein above. In one or moreembodiments, the electron injection layer may further include an organicmaterial. When the electron injection layer further includes an organicmaterial, an alkali metal, an alkaline earth metal, a rare earth metal,an alkali metal compound, an alkaline earth-metal compound, a rare earthmetal compound, an alkali metal complex, an alkaline earth-metalcomplex, a rare earth metal complex, or any combinations thereof may behomogeneously or non-homogeneously dispersed in a matrix including theorganic material.

A thickness of the electron injection layer may be in a range of about 1Å to about 100 Å, for example, about 3 Å to about 90 Å. When thethickness of the electron injection layer is within the range describedherein above, suitable or satisfactory electron injectioncharacteristics may be obtained without a substantial increase indriving voltage.

Second Electrode 190

The second electrode 190 is on the organic layer 150 having such astructure. The second electrode 190 may be a cathode which is anelectron injection electrode, and in this regard, a material for formingthe second electrode 190 may be selected from metal, an alloy, anelectrically conductive compound, and a combination thereof, which havea relatively low work function.

The second electrode 190 may include at least one selected from lithium(Li), silver (Ag), magnesium (Mg), aluminum (Al), aluminum-lithium(Al—Li), calcium (Ca), magnesium-indium (Mg—In), magnesium-silver(Mg—Ag), ITO, and IZO, but embodiments of the present disclosure are notlimited thereto. The second electrode 190 may be a transmissiveelectrode, a semi-transmissive electrode, or a reflective electrode.

The second electrode 190 may have a single-layered structure, or amulti-layered structure including two or more layers.

Description of FIGS. 2 to 4

FIG. 2 is a schematic view of an organic light-emitting device 20according to an embodiment. The organic light-emitting device 20includes a first capping layer 210, the first electrode 110, the organiclayer 150, and the second electrode 190, which are sequentially stackedin this stated order. FIG. 3 is a schematic view of an organiclight-emitting device 30 according to an embodiment. The organiclight-emitting device 30 includes the first electrode 110, the organiclayer 150, the second electrode 190, and a second capping layer 220,which are sequentially stacked in this stated order. FIG. 4 is aschematic view of an organic light-emitting device 40 according to anembodiment. The organic light-emitting device 40 includes the firstcapping layer 210, the first electrode 110, the organic layer 150, thesecond electrode 190, and the second capping layer 220, which aresequentially stacked in this stated order.

Regarding FIGS. 2 to 4, the first electrode 110, the organic layer 150,and the second electrode 190 may be understood by referring to thedescription presented in connection with FIG. 1.

In the organic layer 150 of each of the organic light-emitting devices20 and 40, light generated in an emission layer may pass through thefirst electrode 110 and the first capping layer 210 toward the outside,wherein the first electrode 110 may be a semi-transmissive electrode ora transmissive electrode. In the organic layer 150 of each of theorganic light-emitting devices 30 and 40, light generated in an emissionlayer may pass through the second electrode 190 and the second cappinglayer 220 toward the outside, wherein the second electrode 190 may be asemi-transmissive electrode or a transmissive electrode.

The first capping layer 210 and the second capping layer 220 mayincrease external luminescent efficiency according to the principle ofconstructive interference.

The first capping layer 210 and the second capping layer 220 may eachindependently be an organic capping layer including an organic material,an inorganic capping layer including an inorganic material, or acomposite capping layer including an organic material and an inorganicmaterial.

At least one selected from the first capping layer 210 and the secondcapping layer 220 may each independently include at least one materialselected from carbocyclic compounds, heterocyclic compounds, amine-basedcompounds, porphyrine derivatives, phthalocyanine derivatives, anaphthalocyanine derivatives, alkali metal complexes, and alkalineearth-based complexes. The carbocyclic compound, the heterocycliccompound, and the amine-based compound may be optionally substitutedwith a substituent containing at least one element selected from O, N,S, Se, Si, F, Cl, Br, and I. In one embodiment, at least one selectedfrom the first capping layer 210 and the second capping layer 220 mayeach independently include an amine-based compound.

In one embodiment, at least one selected from the first capping layer210 and the second capping layer 220 may each independently include thecompound represented by Formula 201 or the compound represented byFormula 202.

In one or more embodiments, at least one selected from the first cappinglayer 210 and the second capping layer 220 may each independentlyinclude a compound selected from Compounds HT28 to HT33 and CompoundsCP1 to CP5, but embodiments of the present disclosure are not limitedthereto.

Hereinbefore, the organic light-emitting device according to anembodiment has been described in connection with FIGS. 1 to 4, butembodiments of the present disclosure are not limited thereto.

Layers constituting the hole transport region, an emission layer, andlayers constituting the electron transport region may be formed in acertain region by using one or more suitable methods selected fromvacuum deposition, spin coating, casting, Langmuir-Blodgett (LB)deposition, ink-jet printing, laser-printing, and laser-induced thermalimaging.

When layers constituting the hole transport region, an emission layer,and layers constituting the electron transport region are formed byvacuum deposition, the deposition may be performed at a depositiontemperature of about 100° C. to about 500° C., a vacuum degree of about10⁻⁸ torr to about 10⁻³ torr, and a deposition speed of about 0.01 Å/secto about 100 Å/sec by taking into account a material to be included in alayer to be formed, and the structure of a layer to be formed.

When layers constituting the hole transport region, an emission layer,and layers constituting the electron transport region are formed by spincoating, the spin coating may be performed at a coating speed of about2,000 rpm to about 5,000 rpm and at a heat treatment temperature ofabout 80° C. to 200° C. by taking into account a material to be includedin a layer to be formed, and the structure of a layer to be formed.

Apparatus

The organic light-emitting device may be included in various suitableapparatuses. For example, a light-emitting apparatus, an authenticationapparatus, or an electronic apparatus, which includes the organiclight-emitting device, may be provided.

The light-emitting apparatus may further include, in addition to theorganic light-emitting device, a thin film transistor including a sourceelectrode and a drain electrode. One of the source electrode and thedrain electrode of the thin film transistor may be electrically coupledto one of the first electrode and the second electrode of the organiclight-emitting device. The light-emitting apparatus may be used asvarious suitable displays, light sources, and the like.

The authentication apparatus may be, for example, a biometricauthentication apparatus for authenticating an individual by usingbiometric information of a biometric body (for example, a finger tip, apupil, or the like).

The authentication apparatus may further include, in addition to theorganic light-emitting device, a biometric information collector.

The electronic apparatus may be applied to personal computers (forexample, a mobile personal computer), mobile phones, digital cameras,electronic organizers, electronic dictionaries, electronic gamemachines, medical instruments (for example, electronic thermometers,sphygmomanometers, blood glucose meters, pulse measurement devices,pulse wave measurement devices, electrocardiogram (ECG) displays,ultrasonic diagnostic devices, or endoscope displays), fish finders,various suitable measuring instruments, meters (for example, meters fora vehicle, an aircraft, and a vessel), projectors, and the like, butembodiments of the present disclosure are not limited thereto.

General Definition of at Least Some of the Substituents

The term “C₁-C₆₀ alkyl group,” as used herein, refers to a linear orbranched aliphatic saturated hydrocarbon monovalent group having 1 to 60carbon atoms, and examples thereof include a methyl group, an ethylgroup, a propyl group, an isobutyl group, a sec-butyl group, atert-butyl group, a pentyl group, an isoamyl group, and a hexyl group.The term “C₁-C₆₀ alkylene group,” as used herein, refers to a divalentgroup having substantially the same structure as the C₁-C₆₀ alkyl group.

The term “C₂-C₆₀ alkenyl group,” as used herein, refers to a hydrocarbongroup having at least one carbon-carbon double bond at a main chain(e.g., in the middle) or at a terminal end (e.g., at the terminus) ofthe C₂-C₆₀ alkyl group, and examples thereof include an ethenyl group, apropenyl group, and a butenyl group.

The term “C₂-C₆₀ alkenylene group,” as used herein, refers to a divalentgroup having substantially the same structure as the C₂-C₆₀ alkenylgroup.

The term “C₂-C₆₀ alkynyl group,” as used herein, refers to a hydrocarbongroup having at least one carbon-carbon triple bond at a main chain(e.g., in the middle) or at a terminal end (e.g., at the terminus) ofthe C₂-C₆₀ alkyl group, and examples thereof include an ethynyl group,and a propynyl group. The term “C₂-C₆₀ alkynylene group,” as usedherein, refers to a divalent group having substantially the samestructure as the C₂-C₆₀ alkynyl group.

The term “C₁-C₆₀ alkoxy group,” as used herein, refers to a monovalentgroup represented by —OA₁₀₁ (wherein A₁₀₁ is the C₁-C₆₀ alkyl group),and examples thereof include a methoxy group, an ethoxy group, and anisopropyloxy group.

The term “C₃-C₁₀ cycloalkyl group,” as used herein, refers to amonovalent saturated hydrocarbon monocyclic group having 3 to 10 carbonatoms, and examples thereof include a cyclopropyl group, a cyclobutylgroup, a cyclopentyl group, a cyclohexyl group, and a cycloheptyl group.The term “C₃-C₁₀ cycloalkylene group,” as used herein, refers to adivalent group having substantially the same structure as the C₃-C₁₀cycloalkyl group.

The term “C₁-C₁₀ heterocycloalkyl group,” as used herein, refers to amonovalent monocyclic group having at least one heteroatom selected fromN, O, Si, P, and S as a ring-forming atom and 1 to 10 carbon atoms, andexamples thereof include a 1,2,3,4-oxatriazolidinyl group, atetrahydrofuranyl group, and a tetrahydrothiophenyl group. The term“C₁-C₁₀ heterocycloalkylene group,” as used herein, refers to a divalentgroup having substantially the same structure as the C₁-C₁₀heterocycloalkyl group.

The term “C₃-C₁₀ cycloalkenyl group,” as used herein, refers to amonovalent monocyclic group that has 3 to 10 carbon atoms and at leastone carbon-carbon double bond in the ring thereof and no aromaticity(e.g., the ring and/or group is not aromatic), and examples thereofinclude a cyclopentenyl group, a cyclohexenyl group, and a cycloheptenylgroup. The term “C₃-C₁₀ cycloalkenylene group,” as used herein, refersto a divalent group having substantially the same structure as theC₃-C₁₀ cycloalkenyl group.

The term “C₁-C₁₀ heterocycloalkenyl group,” as used herein, refers to amonovalent monocyclic group that has at least one heteroatom selectedfrom N, O, Si, P, and S as a ring-forming atom, 1 to 10 carbon atoms,and at least one carbon-carbon double bond in its ring. Non-limitingexamples of the C₁-C₁₀ heterocycloalkenyl group include a4,5-dihydro-1,2,3,4-oxatriazolyl group, a 2,3-dihydrofuranyl group, anda 2,3-dihydrothiophenyl group. The term “C₁-C₁₀ heterocycloalkenylenegroup,” as used herein, refers to a divalent group having substantiallythe same structure as the C₁-C₁₀ heterocycloalkenyl group.

The term “C₆-C₆₀ aryl group,” as used herein, refers to a monovalentgroup having a carbocyclic aromatic system having 6 to 60 carbon atoms,and a C₆-C₆₀ arylene group used herein refers to a divalent group havinga carbocyclic aromatic system having 6 to 60 carbon atoms. Non-limitingexamples of the C₆-C₆₀ aryl group include a phenyl group, a naphthylgroup, an anthracenyl group, a phenanthrenyl group, a pyrenyl group, anda chrysenyl group. When the C₆-C₆₀ aryl group and the C₆-C₆₀ arylenegroup each include two or more rings, the rings may be fused to eachother (e.g., combined together).

The term “C₁-C₆₀ heteroaryl group,” as used herein, refers to amonovalent group having a carbocyclic aromatic system that has at leastone heteroatom selected from N, O, Si, P, and S as a ring-forming atom,in addition to 1 to 60 carbon atoms. The term “C₁-C₆₀ heteroarylenegroup,” as used herein, refers to a divalent group having a carbocyclicaromatic system that has at least one heteroatom selected from N, O, Si,P, and S as a ring-forming atom, in addition to 1 to 60 carbon atoms.Non-limiting examples of the C₁-C₆₀ heteroaryl group include a pyridinylgroup, a pyrimidinyl group, a pyrazinyl group, a pyridazinyl group, atriazinyl group, a quinolinyl group, and an isoquinolinyl group. Whenthe C₁-C₆₀ heteroaryl group and the C₁-C₆₀ heteroarylene group eachinclude two or more rings, the rings may be condensed with each other(e.g., combined together).

The term “C₆-C₆₀ aryloxy group,” as used herein, refers to —OA₁₀₂(wherein A₁₀₂ is the C₆-C₆₀ aryl group), and the term “C₆-C₆₀ arylthiogroup,” as used herein, indicates —SA₁₀₃ (wherein A₁₀₃ is the C₆-C₆₀aryl group).

The term “monovalent non-aromatic condensed polycyclic group,” as usedherein, refers to a monovalent group (for example, having 8 to 60 carbonatoms) having two or more rings condensed with each other (e.g.,combined together), only carbon atoms as ring-forming atoms, and noaromaticity in its entire molecular structure (e.g., the entiremolecular structure is not aromatic). An example of the monovalentnon-aromatic condensed polycyclic group is a fluorenyl group. The term“divalent non-aromatic condensed polycyclic group” as used herein refersto a divalent group having substantially the same structure as themonovalent non-aromatic condensed polycyclic group.

The term “monovalent non-aromatic condensed heteropolycyclic group,” asused herein, refers to a monovalent group (for example, having 1 to 60carbon atoms) having two or more rings condensed to each other (e.g.,combined together), at least one heteroatom selected from N, O, Si, P,and S, other than carbon atoms, as a ring-forming atom, and noaromaticity in its entire molecular structure (e.g., the entiremolecular structure is not aromatic). An example of the monovalentnon-aromatic condensed heteropolycyclic group is a carbazolyl group. Theterm “divalent non-aromatic condensed heteropolycyclic group,” as usedherein, refers to a divalent group having substantially the samestructure as the monovalent non-aromatic condensed heteropolycyclicgroup.

The term “C₄-C₆₀ carbocyclic group,” as used herein, refers to amonocyclic or polycyclic group having 4 to 60 carbon atoms in which aring-forming atom is a carbon atom only. The term “C₄-C₆₀ carbocyclicgroup,” as used herein, refers to an aromatic carbocyclic group or anon-aromatic carbocyclic group. The C₄-C₆₀ carbocyclic group may be aring, such as benzene, a monovalent group, such as a phenyl group, or adivalent group, such as a phenylene group. In one or more embodiments,depending on the number of substituents coupled to the C₄-C₆₀carbocyclic group, the C₄-C₆₀ carbocyclic group may be a trivalent groupor a quadrivalent group.

The term “C₁-C₆₀ heterocyclic group,” as used herein, refers to a grouphaving substantially the same structure as the C₄-C₆₀ carbocyclic group,except that as a ring-forming atom, at least one heteroatom selectedfrom N, O, Si, P, and S is used in addition to carbon (the number ofcarbon atoms may be in a range of 1 to 60).

In the present specification, at least one substituent of thesubstituted C₄-C₆₀ carbocyclic group, the substituted C₁-C₆₀heterocyclic group, the substituted C₃-C₁₀ cycloalkylene group, thesubstituted C₁-C₁₀ heterocycloalkylene group, the substituted C₃-C₁₀cycloalkenylene group, the substituted C₁-C₁₀ heterocycloalkenylenegroup, the substituted C₆-C₆₀ arylene group, the substituted C₁-C₆₀heteroarylene group, the substituted divalent non-aromatic condensedpolycyclic group, the substituted divalent non-aromatic condensedheteropolycyclic group, the substituted C₁-C₆₀ alkyl group, thesubstituted C₂-C₆₀ alkenyl group, the substituted C₂-C₆₀ alkynyl group,the substituted C₁-C₆₀ alkoxy group, the substituted C₃-C₁₀ cycloalkylgroup, the substituted C₁-C₁₀ heterocycloalkyl group, the substitutedC₃-C₁₀ cycloalkenyl group, the substituted C₁-C₁₀ heterocycloalkenylgroup, the substituted C₆-C₆₀ aryl group, the substituted C₆-C₆₀ aryloxygroup, the substituted C₆-C₆₀ arylthio group, the substituted C₁-C₆₀heteroaryl group, the substituted monovalent non-aromatic condensedpolycyclic group, and the substituted monovalent non-aromatic condensedheteropolycyclic group may be selected from:

-   -   deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a        nitro group, an amidino group, a hydrazino group, a hydrazono        group, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀        alkynyl group, and a C₁-C₆₀ alkoxy group;    -   a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl        group, and a C₁-C₆₀ alkoxy group, each substituted with at least        one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amidino group, a hydrazino        group, a hydrazono group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀        heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀        heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy        group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, a        monovalent non-aromatic condensed polycyclic group, a monovalent        non-aromatic condensed heteropolycyclic group,        —Si(Q₁₁)(Q₁₂)(Q₁₃), —N(Q₁₁)(Q₁₂), —B(Q₁₁)(Q₁₂), —C(═O)(Q₁₁),        —S(═O)₂(Q₁₁), and —P(═O)(Q₁₁)(Q₁₂);    -   a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic        condensed polycyclic group, and a monovalent non-aromatic        condensed heteropolycyclic group;    -   a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a        C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a        C₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio        group, a C₁-C₆₀ heteroaryl group, a monovalent non-aromatic        condensed polycyclic group, and a monovalent non-aromatic        condensed heteropolycyclic group, each substituted with at least        one selected from deuterium, —F, —Cl, —Br, —I, a hydroxyl group,        a cyano group, a nitro group, an amidino group, a hydrazino        group, a hydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl        group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀        cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀        cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀        aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a        C₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed        polycyclic group, a monovalent non-aromatic condensed        heteropolycyclic group, —Si(Q₂₁)(Q₂₂)(Q₂₃), —N(Q₂₁)(Q₂₂),        —B(Q₂₁)(Q₂₂), —C(═O)(Q₂₁), —S(═O)₂(Q₂₁), and —P(═O)(Q₂₁)(Q₂₂);        and    -   —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂), —C(═O)(Q₃₁),        —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂), and    -   Q₁₁ to Q₁₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ may each independently be        selected from hydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl        group, a cyano group, a nitro group, an amidino group, a        hydrazino group, a hydrazono group, a C₁-C₆₀ alkyl group, a        C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy        group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl        group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl        group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroaryl group, a        monovalent non-aromatic condensed polycyclic group, a monovalent        non-aromatic condensed heteropolycyclic group, a C₁-C₆₀ alkyl        group substituted with at least one selected from deuterium, —F,        and a cyano group, a C₆-C₆₀ aryl group substituted with at least        one selected from deuterium, —F, and a cyano group, a biphenyl        group, and a terphenyl group.

The term “Ph,” as used herein, refers to a phenyl group, the term “Me,”as used herein, refers to a methyl group, the term “Et,” as used herein,refers to an ethyl group, the term “ter-Bu” or “Bu^(t),” as used herein,refers to a tert-butyl group, and the term “OMe,” as used herein, refersto a methoxy group.

The term “biphenyl group,” as used herein, refers to “a phenyl groupsubstituted with a phenyl group.” In other words, the “biphenyl group”is a substituted phenyl group having a C₆-C₆₀ aryl group as asubstituent.

The term “terphenyl group,” as used herein, refers to “a phenyl groupsubstituted with a biphenyl group.” In other words, the “terphenylgroup” is a phenyl group having, as a substituent, a C₆-C₆₀ aryl groupsubstituted with a C₆-C₆₀ aryl group.

-   -   and *′ as used herein, unless defined otherwise, each refer to a        binding site to a neighboring atom in a corresponding formula.

Hereinafter, a compound according to embodiments and an organiclight-emitting device according to embodiments will be described in moredetail with reference to Synthesis Examples and Examples. The wording “Bwas used instead of A” used in describing the Synthesis Examplesindicates that an identical molar equivalent of B was used in place ofA.

EXAMPLE Synthesis Example 1: Synthesis of Compound 1

Synthesis of Intermediate 1-1

Dichlorodiphenylsilane (CAS #=80-10-4) was reacted with nBuLi and thenreacted with 9-(3-bromophenyl)-9H-carbazole (CAS #=185112-61-2) toobtain Intermediate 1-1. Intermediate 1-1 was identified by liquidchromatography-mass spectrometry (LC-MS).C₃₀H₂₂ClNSi:M+1 456.34.Synthesis of Compound 1

A reaction container in which 3.5 g of Intermediate 1-1 was dissolved in50 mL of tetrahydrofuran (THF) was cooled to a temperature of −78° C.,and 3 mL of nBuLi was added dropwise thereto. After the reaction mixturewas maintained at a temperature of −78° C. for 1 hour,9-(4-bromophenyl)-9-phenyl-9H-fluorene (CAS #=937082-81-0) was addedthereto and stirred at room temperature for 24 hours. After the reactionwas completed, the reaction solution was extracted therefrom by usingethyl acetate. An organic layer collected therefrom was dried by usingmagnesium sulfate, and a residue obtained by evaporating a solventtherefrom was separated and purified by silica gel column chromatographyto obtain 4 g (yield: 70%) of Compound 1. Compound 1 was identified byLC-MS and proton nuclear magnetic resonance spectrometry (¹H-NMR).

Synthesis Example 2: Synthesis of Compound 2

Synthesis of Intermediate 2-1

Dichlorodiphenylsilane (CAS #=80-10-4) was reacted with nBuLi and thenreacted with 9,9′-(5-bromo-1,3-phenylene)bis(9H-carbazole) (CAS#=750573-24-1) to obtain Intermediate 2-1. Intermediate 2-1 wasidentified by LC-MS.C₄₂H₂₉ClN₂Si:M+1 625.21.Synthesis of Compound 2

2.8 g (48%) of Compound 2 was synthesized in substantially the samemanner as in Synthesis of Compound 1, except that9,9′-(5-(chlorodiphenylsilyl)-1,3-phenylene)bis(9H-carbazole) (Compound2-1) was used instead of 9-(3-(chlorodiphenylsilyl)phenylI)-9H-carbazole (Compound 1-1). Compound 2 was identified by LC-MS and¹H-NMR.

Synthesis Example 3: Synthesis of Compound 5

Synthesis of Intermediate 5-1

1,4-dibromobenzene (CAS #=106-37-6) was reacted with nBuLi and thenreacted with chlorotriphenylsilane (9H-carbazole) (CAS #=76-86-8) toobtain Intermediate 5-1. Intermediate 5-1 was identified by LC-MS.C₂₄H₁₉BrSi:M+1 415.01.Synthesis of Intermediate 5-2

Intermediate 5-1 was reacted with nBuLi and then reacted withbis(pinacolate)diboron (CAS #=73183-34-3) to obtain Intermediate 5-2.Intermediate 5-2 was identified by LC-MS.C₃₀H₃₁BO₂Si:M+1 463.21.Synthesis of Intermediate 5-3

Intermediate 5-2 was reacted with 1-bromo-2-nitrobenzene (CAS#=577-19-5) in a Pd catalyst condition to obtain Intermediate 5-3.Intermediate 5-3 was identified by LC-MS.C₃₀H₂₃NO₂Si:M+1 458.18.Synthesis of Intermediate 5-4

Intermediate 5-3 was reacted with triphenylphosphine to obtainIntermediate 5-4. Intermediate 5-4 was identified by LC-MS.C₃₀H₂₃NSi:M+1 429.29.Synthesis of Intermediate 5-5

Intermediate 5-4 was reacted with 1-bromo-3-fluorobenzene (CAS#=1073-06-9) in a Pd catalyst condition to obtain Intermediate 5-5.Intermediate 5-5 was identified by LC-MS.C₃₆H₂₆BrNSi:M+1 580.30.Synthesis of Intermediate 5-6

Dichlorodiphenylsilane (CAS #=80-10-4) was reacted with nBuLi and thenreacted with Intermediate 5-5 to obtain Intermediate 5-6. Intermediate5-6 was identified by LC-MS.C₄₂H₂₉ClN₂Si:M+1 625.25.Synthesis of Compound 5

A reaction container in which 4 g of Intermediate 5-6 was dissolved in50 mL of THF was cooled to a temperature of −78° C., and 2.3 mL of nBuLiwas added dropwise thereto. After the reaction mixture was maintained ata temperature of −78° C. for 1 hour,9-(3-bromophenyl)-9-phenyl-9H-fluorene (CAS #=1257251-75-4) was addedand stirred at room temperature for 24 hours. After the reaction wascompleted, the reaction solution was extracted therefrom by using ethylacetate. An organic layer collected therefrom was dried by usingmagnesium sulfate, and a residue obtained by evaporating a solventtherefrom was separated and purified by silica gel column chromatographyto obtain 3.7 g (yield: 66%) of Compound 5. Compound 5 was identified byLC-MS and ¹H-NMR.

Synthesis Example 4: Synthesis of Compound 6

Synthesis of Intermediate 6-1

1,4-dibromo-2-fluorobenzene (CAS #=1435-52-5) was reacted with carbazolein a Pd catalyst condition to obtain Intermediate 6-1. Intermediate 6-1was identified by LC-MS.C₁₈H₁₁Br₂N:M+1 399.89.Synthesis of Intermediate 6-2

Intermediate 6-1 reacted with 2-(9-carbazolyl)phenylboronic acid (CAS#=1189047-28-6) in a Pd catalyst condition to obtain Intermediate 6-2.Intermediate 6-2 was identified by LC-MS.C₃₆H₂₃BrN₂:M+1 563.24.Synthesis of Intermediate 6-3

Dichlorodiphenylsilane (CAS #=80-10-4) reacted with nBuLi and thenreacted with Intermediate 6-2 to obtain Intermediate 6-3. Intermediate6-3 was identified by LC-MS.C₄₈H₃₃ClN₂Si:M+1 701.38.Synthesis of Compound 6

5 g (70%) of Compound 6 was synthesized in substantially the same manneras in Synthesis of Compound 2, except that9,9′-(4-(chlorodiphenylsilane)-[1,1′-biphenyl]-2,2′-diyl)bis(9H-carbazole)(Compound 6-3) was used instead of9,9′-(5-(chlorodiphenylsilyl)-1,3-phenylene)bis(9H-carbazole) (Compound2-1). Compound 6 was identified by LC-MS and ¹H-NMR.

Synthesis Example 5: Synthesis of Compound 7

Synthesis of Intermediate 7-1

1-bromo-3,5-difluorobenzene (CAS #=461-96-1) was reacted with10H-phenoxazine (CAS #=135-67-1) in a Pd catalyst condition to obtainIntermediate 7-1. Intermediate 7-1 was identified by LC-MS.C₃₀H₁₉BrN₂O₂:M+1 519.18.Synthesis of Intermediate 7-2

Dichlorodiphenylsilane (CAS #=80-10-4) reacted with nBuLi and thenreacted with Intermediate 7-1 to obtain Intermediate 7-2. Intermediate7-2 was identified by LC-MS.C₄₂H₂₉ClN₂O₂Si:M+1 657.23.Synthesis of Compound 7

4.5 g (80%) of Compound 7 was synthesized in substantially the samemanner as in Synthesis of Compound 2, except that10,10′-(5-(chlorodiphenylsilyl)-1,3-phenylene)bis(1 OH-phenoxazine)(Compound 7-2) was used instead of9,9′-(5-(chlorodiphenylsilyl)-1,3-phenylene)bis(9H-carbazole) (Compound2-1). Compound 7 was identified by LC-MS and ¹H-NMR.

Synthesis Example 6: Synthesis of Compound 13

Synthesis of Intermediate 13-1

1,4-dibromo-2-fluorobenzene (CAS #=1435-52-5) was reacted with9,9-dimethylacridine (CAS #=6267-02-3) in a Pd catalyst condition toobtain Intermediate 13-1. Intermediate 13-1 was identified by LC-MS.C₂₁H₁₇Br₂N:M+1 441.97.Synthesis of Intermediate 13-2

Intermediate 13-1 was reacted with 3-(9-carbazolyl)phenylboronic acid(CAS #=864377-33-3) in a Pd catalyst condition to obtain Intermediate13-2. Intermediate 13-2 was identified by LC-MS.C₃₉H₂₉BrN₂:M+1 605.31.Synthesis of Intermediate 13-3

Dichlorodiphenylsilane (CAS #=80-10-4) was reacted with nBuLi and thenreacted with Intermediate 13-2 to obtain Intermediate 13-3. Intermediate13-3 was identified by LC-MS.C₅₁H₃₉ClN₂Si:M+1 743.31.Synthesis of Compound 13

4.3 g (70%) of Compound 13 was synthesized in substantially the samemanner as in Synthesis of Compound 2, except that10-(3′-(9H-carbazole-9-yl)-5-(chlorodiphenylsilyl)-[1,1′-biphenyl]-3-yl)-9,9-dimethyl-9,10-dihydroacridine(Compound 13-3) was used instead of9,9′-(5-(chlorodiphenylsilyl)-1,3-phenylene)bis(9H-carbazole) (Compound2-1). Compound 13 was identified by LC-MS and ¹H-NMR.

Synthesis Example 7: Synthesis of Compound 26

Synthesis of Compound 26

5.4 g (75%) of Compound 26 was synthesized in substantially the samemanner as in Synthesis of Compound 2, except that9-(3-bromophenyl)-9-phenyl-9H-fluorene was used instead of9-(4-bromophenyl)-9-phenyl-9H-fluorene. Compound 26 was identified byLC-MS and ¹H-NMR.

Synthesis Example 8: Synthesis of Compound 31

Synthesis of Intermediate 31-1

3-(9-carbazolyl)phenylboronic acid (CAS #=864377-33-3) was reacted with1,3-dibromobenzene (CAS #=108-36-1) in a Pd catalyst condition to obtainIntermediate 31-1. Intermediate 31-1 was identified by LC-MS.C₂₄H₁₆BrN:M+1 398.11.Synthesis of Intermediate 31-2

Dichlorodiphenylsilane (CAS #=80-10-4) was reacted with nBuLi and thenreacted with Intermediate 31-1 to obtain Intermediate 31-2. Intermediate31-2 was identified by LC-MS.C₃₆H₂₆ClNSi:M+1 536.21.Synthesis of Compound 31

7.2 g (78%) of Compound 31 was synthesized in substantially the samemanner as in Synthesis of Compound 2, except that9-(3′-(chlorodiphenylsilyl)-[1,1′-biphenyl]-3-yl)-9H-carbazole (Compound31-2) was used instead of9,9′-(5-(chlorodiphenylsilyl)-1,3-phenylene)bis(9H-carbazole) (Compound2-1). Compound 31 was identified by LC-MS and ¹H-NMR.

¹H NMR and MS/FAB of Compounds of Synthesis Examples are shown in Table1.

Synthesis methods of compounds other than Compounds shown in Table 1 mayalso be easily recognized by those of ordinary skill in the art byreferring to the synthesis mechanisms and source materials describedherein above.

TABLE 1 MS/FAB Found ¹H NMR (CDCl₃, 400 MHz) [M + 1] calculated 18.13-8.10 (2H, m), 7.89-7.87 (2H, m), 742.32 741.29 7.68-7.65 (4H, m),7.51-7.41 (5H, m), 7.35-7.24 (15H, m), 7.13-7.11 (7H, m), 6.84-6.82 (2H,m), 5.81-5.78 (2H, m) 2 8.12-8.10 (4H, m), 7.89-7.87 (2H, m), 907.32906.34 7.74-7.71 (4H, m), 7.46-7.42 (2H, d), 7.38-7.34 (4H, m),7.33-7.26 (14H, m), 7.25-7.22 (3H, m), 7.13-7.11 (7H, m), 7.07 (2H, d),6.84-6.82 (2H, q), 5.80-5.78 (2H, m) 5 8.30-8.27 (1H, m), 8.10-8.08 (1H,m), 1000.29 999.37 7.90-7.88 (2H, m), 7.80-7.78 (1H, m), 7.73-7.70 (4H,m), 7.66-7.60 (8H, m), 7.56 (1H, t), 7.48-7.44 (4H, m), 7.40-7.31 (13H,m), 7.24-7.08 (14H, m), 6.78-6.65 (3H, m), 5.81 (1H, t) 6 8.14-8.12 (4H,m), 7.90-7.88 (2H, m), 983.40 982.37 7.80-7.70 (5H, m), 7.64-7.61 (2H,m), 7.44-7.22 (25H, m), 7.14-7.06 (8H, m), 6.79-6.77 (2H, m), 6.67 (1H,t), 5.81 (1H, t) 7 7.90-7.88 (2H, m), 7.74-7.70 (4H, m), 939.38 938.337.59-7.56 (1H, m), 7.44 (2H, t), 7.35-7.31 (4H, m), 7.26-7.22 (4H, m),7.14-7.04 (6H, m), 6.83-6.55 (22H, m), 5.80 (1H, t) 13 8.12-8.10 (2H,m), 7.90-7.88 (2H, m), 1025.49 1024.42 7.76-7.72 (5H, m), 7.61-7.42 (7H,m), 7.35-7.24 (14H, m), 7.16-7.06 (8H, m), 7.00-6.96 (2H, m), 6.85-6.78(7H, m), 6.73 (1H, t), 6.68-6.65 (1H, m), 5.80 (1H, t), 1.76-1.75 (3H,m), 1.67-1.66 (3H, m) 26 8.12-8.10 (4H, m), 7.89-7.84 (3H, m), 907.35906.34 7.80-7.77 (5H, m), 7.44 (2H, t), 7.36-7.24 (22H, m), 7.24 (1H,s), 7.16-7.08 (5H, m), 6.79-6.67 (3H, m), 5.80 (1H, t) 31 8.12-8.10 (2H,m), 7.90-7.88 (2H, m), 818.29 817.32 7.79-7.65 (8H, m), 7.50 (1H, t),7.46-7.42 (3H, m), 7.35-7.23 (15H, m), 7.18-7.08 (8H, m), 6.78-6.67 (3H,m), 5.80 (1H, t)

Manufacture of Organic Light-Emitting Device

Example 1

As an anode, a Corning 15 Ω/cm² (1,200Δ) ITO glass substrate was cut toa size of 50 mm×50 mm×0.7 mm, sonicated with isopropyl alcohol and purewater each for 5 minutes, and then cleaned by exposure to ultravioletrays and ozone. Then, the ITO glass substrate was provided to a vacuumdeposition apparatus.

An existing compound, NPD, was vacuum-deposited on the ITO glasssubstrate to form a hole injection layer having a thickness of 300 Å,and a hole transport compound TCTA was vacuum-deposited on the holeinjection layer to form a hole transport layer having a thickness of 200Å. A hole transport layer compound CzSi was vacuum-deposited on the holetransport layer to a thickness of 100 Å.

An emission layer host Compound 1 and a dopant Ir(pmp)₃ wereco-deposited on the hole transport layer at a weight ratio of 92:8 toform an emission layer having a thickness of 250 Å. An electrontransport layer compound TSPO1 was formed to a thickness of 200 Å, andan electron injection layer compound TPBI was deposited to a thicknessof 300 Å.

An alkali metal halide LiF was deposited on the electron transport layerto form an electron injection layer having a thickness of 10 Å, and Alwas vacuum-deposited to form a cathode electrode having a thickness of3,000 Å, thereby forming a LiF/Al electrode. In this manner, an organiclight-emitting device was manufactured.

Examples 2 to 8

Organic light-emitting devices were manufactured in substantially thesame manner as in Example 1, except that Compounds 2, 5, 6, 7, 13, 26,and 31 were each used in Examples 2 to 8, respectively, instead ofCompound 1 in forming a blue emission layer.

Comparative Example 1

An organic light-emitting device was manufactured in substantially thesame manner as in Example 1, except that an existing blue host, mCP, wasused in forming a blue emission layer.

Comparative Example 2

An organic light-emitting device was manufactured in substantially thesame manner as in Example 1, except that an existing blue host, Compound100, was used in forming a blue emission layer.

Comparative Example 3

An organic light-emitting device was manufactured in substantially thesame manner as in Example 1, except that an existing blue host, Compound200, was used in forming a blue emission layer.

The driving voltage, luminescent efficiency, and maximum quantumefficiency of the organic light-emitting devices manufactured accordingto Examples 1 to 8 and Comparative Examples 1 to 3 were measured, andresults thereof are shown in Table 2.

TABLE 2 Driving Current Maximum Emission voltage density quantumEmission material (V) (mA/cm²) efficiency (%) color Example 1 Compound 14.1 2.3 12.9 Blue Example 2 Compound 2 3.9 2.3 14.5 Blue Example 3Compound 5 4.5 2.3 14.8 Blue Example 4 Compound 6 4.2 2.3 13.8 BlueExample 5 Compound 7 4.3 2.3 13.8 Blue Example 6 Compound 13 4.3 2.310.1 Blue Example 7 Compound 26 4.0 2.3 15.5 Blue Example 8 Compound 314.1 2.3 14.2 Blue Comparative mCP 4.4 2.3 13.1 Blue Example 1Comparative 100 4.6 2.3 9.3 Blue Example 2 Comparative 200 4.9 2.3 12.2Blue Example 3

From Table 2, it is confirmed that the organic light-emitting devices ofExamples 1 to 8 show excellent results, as compared with those of theorganic light-emitting devices of Comparative Examples 1 to 3.

When the compound represented by Formula 1 according to one or moreembodiments is used in the emission layer, the efficiency may beincreased as compared with other existing compounds.

It should be understood that embodiments described herein should beconsidered in a descriptive sense only and not for purposes oflimitation. Descriptions of features or aspects within each embodimentshould be considered as available for other similar features or aspectsin other embodiments.

It will be understood that, although the terms “first,” “second,”“third,” etc., may be used herein to describe various elements,components, regions, layers and/or sections, these elements, components,regions, layers and/or sections should not be limited by these terms.These terms are used to distinguish one element, component, region,layer or section from another element, component, region, layer orsection. Thus, a first element, component, region, layer or sectiondescribed below could be termed a second element, component, region,layer or section, without departing from the spirit and scope of thepresent disclosure.

Spatially relative terms, such as “beneath,” “below,” “lower,” “under,”“above,” “upper,” and the like, may be used herein for ease ofexplanation to describe one element or feature's relationship to anotherelement(s) or feature(s) as illustrated in the figures. It will beunderstood that the spatially relative terms are intended to encompassdifferent orientations of the device in use or in operation, in additionto the orientation depicted in the figures. For example, if the devicein the figures is turned over, elements described as “below” or“beneath” or “under” other elements or features would then be oriented“above” the other elements or features. Thus, the example terms “below”and “under” can encompass both an orientation of above and below. Thedevice may be otherwise oriented (e.g., rotated 90 degrees or at otherorientations) and the spatially relative descriptors used herein shouldbe interpreted accordingly.

It will be understood that when an element or layer is referred to asbeing “on,” “connected to,” or “coupled to” another element or layer, itcan be directly on, connected to, or coupled to the other element orlayer, or one or more intervening elements or layers may be present. Inaddition, it will also be understood that when an element or layer isreferred to as being “between” two elements or layers, it can be theonly element or layer between the two elements or layers, or one or moreintervening elements or layers may also be present.

The terminology used herein is for the purpose of describing particularembodiments only and is not intended to be limiting of the presentdisclosure. As used herein, the singular forms “a” and “an” are intendedto include the plural forms as well, unless the context clearlyindicates otherwise. It will be further understood that the terms“comprises,” “comprising,” “includes,” and “including,” when used inthis specification, specify the presence of the stated features,integers, acts, operations, elements, and/or components, but do notpreclude the presence or addition of one or more other features,integers, acts, operations, elements, components, and/or groups thereof.

As used herein, the terms “substantially,” “about,” and similar termsare used as terms of approximation and not as terms of degree, and areintended to account for the inherent deviations in measured orcalculated values that would be recognized by those of ordinary skill inthe art. Further, the use of “may” when describing embodiments of thepresent disclosure refers to “one or more embodiments of the presentdisclosure.” As used herein, the terms “use,” “using,” and “used” may beconsidered synonymous with the terms “utilize,” “utilizing,” and“utilized,” respectively. Also, the term “exemplary” is intended torefer to an example or illustration.

Also, any numerical range recited herein is intended to include allsub-ranges of the same numerical precision subsumed within the recitedrange. For example, a range of “1.0 to 10.0” is intended to include allsubranges between (and including) the recited minimum value of 1.0 andthe recited maximum value of 10.0, that is, having a minimum value equalto or greater than 1.0 and a maximum value equal to or less than 10.0,such as, for example, 2.4 to 7.6. Any maximum numerical limitationrecited herein is intended to include all lower numerical limitationssubsumed therein, and any minimum numerical limitation recited in thisspecification is intended to include all higher numerical limitationssubsumed therein. Accordingly, Applicant reserves the right to amendthis specification, including the claims, to expressly recite anysub-range subsumed within the ranges expressly recited herein.

While one or more embodiments have been described with reference to thefigures, it will be understood by those of ordinary skill in the artthat various changes in form and details may be made therein withoutdeparting from the spirit and scope as defined by the following claims,and equivalents thereof.

What is claimed is:
 1. A compound represented by Formula 1:

wherein, in Formula 1, X₁ and X₂ are each independently selected from asingle bond, O, S, NR₁₁R₁₂, CR₁₃R₁₄, and SiR₁₅R₁₆, R₁ to R₉ and R₁₁ toR₁₆ are each independently selected from hydrogen, deuterium, asubstituted or unsubstituted C₁-C₆₀ alkyl group, a substituted orunsubstituted C₂-C₆₀ alkenyl group, a substituted or unsubstitutedC₂-C₆₀ alkynyl group, a substituted or unsubstituted C₁-C₆₀ alkoxygroup, a substituted or unsubstituted C₃-C₁₀ cycloalkyl group, asubstituted or unsubstituted C₁-C₁₀ heterocycloalkyl group, asubstituted or unsubstituted C₃-C₁₀ cycloalkenyl group, a substituted orunsubstituted C₁-C₁₀ heterocycloalkenyl group, a substituted orunsubstituted C₆-C₆₀ aryl group, a substituted or unsubstituted C₆-C₆₀aryloxy group, a substituted or unsubstituted C₆-C₆₀ arylthio group, asubstituted or unsubstituted C₁-C₆₀ heteroaryl group, a substituted orunsubstituted monovalent non-aromatic condensed polycyclic group, asubstituted or unsubstituted monovalent non-aromatic condensedheteropolycyclic group, —Si(Q₁)(Q₂)(Q₃), —N(Q₁)(Q₂), —B(Q₁)(Q₂),—P(Q₁)(Q₂), —C(═O)(Q₁), —S(═O)₂(Q₁), and —P(═O)(Q₁)(Q₂), L₁ to L₄ areeach independently selected from a single bond, a substituted orunsubstituted C₄-C₆₀ carbocyclic group, and a substituted orunsubstituted C₁-C₆₀ heterocyclic group, wherein a case where L₂ to L₄are each a single bond at the same time is excluded, n is 0 or 1, a1 anda2 are each independently 0 or 1, when a2 is 0, n is 0, b3, b4, and b6to b9 are each independently an integer from 1 to 4, b5 is an integerfrom 1 to 5, when b3 to b9 are each independently two or more, two ormore adjacent substituents selected from R₃, R₄, R₅, R₆, R₇, R₈, and R₉are coupled to form a ring, at least one substituent of the substitutedC₁-C₆₀ alkyl group, the substituted C₂-C₆₀ alkenyl group, thesubstituted C₂-C₆₀ alkynyl group, the substituted C₁-C₆₀ alkoxy group,the substituted C₃-C₁₀ cycloalkyl group, the substituted C₁-C₁₀heterocycloalkyl group, the substituted C₃-C₁₀ cycloalkenyl group, thesubstituted C₁-C₁₀ heterocycloalkenyl group, the substituted C₆-C₆₀ arylgroup, the substituted C₆-C₆₀ arylene group, the substituted C₆-C₆₀aryloxy group, the substituted C₆-C₆₀ arylthio group, the substitutedC₁-C₆₀ heteroaryl group, the substituted C₁-C₆₀ heteroarylene group, thesubstituted monovalent non-aromatic condensed polycyclic group, thesubstituted monovalent non-aromatic condensed heteropolycyclic group,the substituted C₄-C₆₀ carbocyclic group, and the substituted C₁-C₆₀heterocyclic group is selected from: deuterium, —F, —Cl, —Br, —I, ahydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, and a C₁-C₆₀ alkoxy group; aC₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, anda C₁-C₆₀ alkoxy group, each substituted with at least one selected fromdeuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group, a nitrogroup, an amidino group, a hydrazino group, a hydrazono group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —Si(Q₁₁)(Q₁₂)(Q₁₃),—N(Q₁₁)(Q₁₂), —B(Q₁₁)(Q₁₂), —C(═O)(Q₁₁), —S(═O)₂(Q₁₁), and—P(═O)(Q₁₁)(Q₁₂); a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkylgroup, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, aC₆-C₆₀ aryl group, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, aC₁-C₆₀ heteroaryl group, a monovalent non-aromatic condensed polycyclicgroup, and a monovalent non-aromatic condensed heteropolycyclic group; aC₃-C₁₀ cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀cycloalkenyl group, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ arylgroup, a C₆-C₆₀ aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀heteroaryl group, a monovalent non-aromatic condensed polycyclic group,and a monovalent non-aromatic condensed heteropolycyclic group, eachsubstituted with at least one selected from deuterium, —F, —Cl, —Br, —I,a hydroxyl group, a cyano group, a nitro group, an amidino group, ahydrazino group, a hydrazono group, a C₁-C₆₀ alkyl group, a C₂-C₆₀alkenyl group, a C₂-C₆₀ alkynyl group, a C₁-C₆₀ alkoxy group, a C₃-C₁₀cycloalkyl group, a C₁-C₁₀ heterocycloalkyl group, a C₃-C₁₀ cycloalkenylgroup, a C₁-C₁₀ heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₆-C₆₀aryloxy group, a C₆-C₆₀ arylthio group, a C₁-C₆₀ heteroaryl group, amonovalent non-aromatic condensed polycyclic group, a monovalentnon-aromatic condensed heteropolycyclic group, —Si(Q₂₁)(Q₂₂)(Q₂₃),—N(Q₂₁)(Q₂₂), —B(Q₂₁)(Q₂₂), —C(═O)(Q₂₁), —S(═O)₂(Q₂₁), and—P(═O)(Q₂₁)(Q₂₂); and —Si(Q₃₁)(Q₃₂)(Q₃₃), —N(Q₃₁)(Q₃₂), —B(Q₃₁)(Q₃₂),—C(═O)(Q₃₁), —S(═O)₂(Q₃₁), and —P(═O)(Q₃₁)(Q₃₂), and Q₁ to Q₃, Q₁₁ toQ₁₃, Q₂₁ to Q₂₃, and Q₃₁ to Q₃₃ are each independently selected fromhydrogen, deuterium, —F, —Cl, —Br, —I, a hydroxyl group, a cyano group,a nitro group, an amidino group, a hydrazino group, a hydrazono group, aC₁-C₆₀ alkyl group, a C₂-C₆₀ alkenyl group, a C₂-C₆₀ alkynyl group, aC₁-C₆₀ alkoxy group, a C₃-C₁₀ cycloalkyl group, a C₁-C₁₀heterocycloalkyl group, a C₃-C₁₀ cycloalkenyl group, a C₁-C₁₀heterocycloalkenyl group, a C₆-C₆₀ aryl group, a C₁-C₆₀ heteroarylgroup, a monovalent non-aromatic condensed polycyclic group, amonovalent non-aromatic condensed heteropolycyclic group, a biphenylgroup, and a terphenyl group.
 2. The compound of claim 1, wherein: X₁and X₂ are each independently selected from a single bond, O, S,CR₁₃R₁₄, and SiR₁₅R₁₆.
 3. The compound of claim 1, wherein: L₁ to L₄ areeach independently selected from a single bond, a phenylene group, anaphthylene group, a phenanthrenylene group, an anthracenylene group, apyrenylene group, a chrysenylene group, a pyridinylene group, apyrazinylene group, a pyrimidinylene group, a pyridazinylene group, aquinolinylene group, an isoquinolinylene group, a quinoxalinylene group,a quinazolinylene group, a carbazolylene group, and a triazinylenegroup.
 4. The compound of claim 1, wherein: L₁ and L₂ are each aphenylene group at the same time, and L₃ and L₄ are each independently asingle bond or a phenylene group.
 5. The compound of claim 1, wherein:R₁ and R₂ are each independently selected from a phenyl group, abiphenyl group, a terphenyl group, a naphthyl group, a phenanthrenylgroup, an anthracenyl group, a pyrenyl group, a chrysenyl group, apyridinyl group, a pyrazinyl group, a pyrimidinyl group, a pyridazinylgroup, a quinolinyl group, an isoquinolinyl group, a quinoxalinyl group,a quinazolinyl group, a carbazolyl group, a dibenzofuranyl group, adibenzothiophenyl group, a triazinyl group, a benzimidazolyl group, anda phenanthrolinyl group.
 6. The compound of claim 1, wherein: R₁ and R₂are each independently represented by Formula 2a:

wherein, in Formula 2a, R₂₁ is selected from hydrogen, deuterium, —F,—Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an aminogroup, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a phenanthrenyl group, an anthracenylgroup, a pyrenyl group, a chrysenyl group, a pyridinyl group, apyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinylgroup, an isoquinolinyl group, a quinoxalinyl group, a quinazolinylgroup, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a triazinyl group, a benzimidazolyl group, and a phenanthrolinylgroup, a21 is an integer from 0 to 4, and * indicates a binding site toa neighboring atom.
 7. The compound of claim 1, wherein: R₁₁ to R₁₆ areeach independently selected from a methyl group, an ethyl group, ann-propyl group, an isopropyl group, an n-butyl group, an isobutyl group,a sec-butyl group, and a tert-butyl group.
 8. The compound of claim 1,wherein: R₃, R₄, and R₅ are each independently selected from hydrogen,deuterium, —N(Q₁)(Q₂), and a group represented by Formula 3a:

wherein, in Formula 3a, R₃₁ is selected from hydrogen, deuterium, —F,—Cl, —Br, —I, a hydroxyl group, a cyano group, a nitro group, an aminogroup, an amidino group, a hydrazine group, a hydrazone group, acarboxylic acid group or a salt thereof, a sulfonic acid group or a saltthereof, a phosphoric acid group or a salt thereof, a C₁-C₂₀ alkylgroup, a C₁-C₂₀ alkoxy group, a phenyl group, a biphenyl group, aterphenyl group, a naphthyl group, a phenanthrenyl group, an anthracenylgroup, a pyrenyl group, a chrysenyl group, a pyridinyl group, apyrazinyl group, a pyrimidinyl group, a pyridazinyl group, a quinolinylgroup, an isoquinolinyl group, a quinoxalinyl group, a quinazolinylgroup, a carbazolyl group, a dibenzofuranyl group, a dibenzothiophenylgroup, a triazinyl group, a benzimidazolyl group, and a phenanthrolinylgroup, a31 is an integer from 0 to 4, and * indicates a binding site toa neighboring atom.
 9. The compound of claim 1, wherein: R₆ to R₉ areeach independently selected from hydrogen, deuterium, —Si(Q₁)(Q₂)(Q₃), amethyl group, an ethyl group, an n-propyl group, an isopropyl group, ann-butyl group, an isobutyl group, a sec-butyl group, and a tert-butylgroup.
 10. The compound of claim 1, wherein: the compound represented byFormula 1 is selected from Compounds 1 to 33:


11. An organic light-emitting device comprising: a first electrode; asecond electrode facing the first electrode; and an organic layerbetween the first electrode and the second electrode and comprising anemission layer, wherein the organic layer comprises the compound ofclaim
 1. 12. The organic light-emitting device of claim 11, wherein: thefirst electrode is an anode, the second electrode is a cathode, and theorganic layer between the first electrode and the second electrode andcomprising the emission layer comprises i) a hole transport regionbetween the first electrode and the emission layer and comprising a holeinjection layer, a hole transport layer, a buffer layer, an electronblocking layer, or any combination thereof and ii) an electron transportregion between the emission layer and the second electrode andcomprising a hole blocking layer, an electron transport layer, anelectron injection layer, or any combination thereof.
 13. The organiclight-emitting device of claim 11, wherein: the emission layer is aphosphorescence emission layer.
 14. The organic light-emitting device ofclaim 11, wherein: the emission layer is a fluorescence emission layer.15. The organic light-emitting device of claim 11, wherein: the emissionlayer is a phosphorescence emission layer, and the compound is a host.16. The organic light-emitting device of claim 11, wherein: the emissionlayer comprises an iridium complex as a phosphorescent dopant.
 17. Theorganic light-emitting device of claim 11, wherein: the emission layercomprises Ir(pmp)₃ as a phosphorescent dopant.
 18. The organiclight-emitting device of claim 12, wherein: the electron transportregion comprises a metal-containing material.
 19. The organiclight-emitting device of claim 12, wherein: the electron injection layercomprises an alkali metal halide.
 20. An electronic apparatuscomprising: a thin-film transistor; and the organic light-emittingdevice of claim 11, wherein the thin-film transistor comprises a sourceelectrode, a drain electrode, an activation layer, and a gate electrode,and the first electrode of the organic light-emitting device iselectrically coupled to one of the source electrode and the drainelectrode of the thin-film transistor.